YouTube and Netflix: throttling in image quality?

Today it is very big in the news that YouTube and Netflix want to temporarily reduce their picture quality in order to take less data volume from other Internet traffic.

My questions here are:

At what point is it no longer possible to watch videos and series in Full HD? For me it's still working.
If YouTube no longer allows 1080p, will 720p still work at 60fps?
Does the throttling on YouTube only affect videos that have been uploaded now or generally all of them?
How long will it last?
When the throttling is over, will higher quality versions be "unlocked" again?
If you have booked the 4k option with Netflix, will you get your money back or partially refunded, since the advantages in terms of quality are no longer visible?
Have you noticed any changes yet? So far I can still watch everything in Full HD and YouTube still gives me the option to do so.

I'm sorry if some of the questions can't be answered, but maybe you have already read more or have a premonition.

You don't really know. The throttling should be felt first in the USA and then in Europe etc. Think this week the throttling will be felt.
I do not know.
Certainly everyone. One wants to achieve the greatest possible effect and the quality basically remains the same, only the consumers see nothing of it.
It all depends on the development of curfews and the virus. The faster the number of infected people decrease, the faster YouTube will restore the standard quality.
Yes, then everyone can enjoy the original quality of the videos again.
I assume, but I have no idea
No, not really yet. I'm not sure

1: If a lot of people at the same time we look throttled dynamically.

2: Yes, the quality is gradually lowered and increased.

3: All

4: you will see, but if you look against fewer people, higher quality will be delivered again.

5: yes see 4

6: one will see. Because of the 3 euro money back request would be a testimony of small-mindedness.

7: no

Oh yes, what you have to point out again: The measure is completely unnecessary. If there's an overload in the network, packages are dropped. The client recognizes this and automatically requests the next lower quality level to ensure playback.

First of all, thank you for your quick and helpful answer! In response to your answer, I just wanted to add that (as far as I know) "only" the EU is affected by the blockade, it has not yet been decided in the USA. However, this may also only be a matter of time.

Otherwise, thanks again, that helped me a lot!

Thank you also for your answer, I partly also doubt the efficiency of this throttling measure, at least in Germany. Here is an interesting interview of the time: https://www.zeit.de/digital/internet/2020-03/internet-coronavirus-pandemie-datenverkehr-traffic

Why should this be felt first in the US?

Well, YouTube (Google) is an American company and from experience YouTube innovations of all kinds only affect the Americans.

I also think that the transmission quality differs depending on the location. But according to jupiter, this regulation seems to be limited to the EU or Europe anyway, so it makes my declaration overdue (if it is true).

As I have already explained, throttling will happen dynamically after load and everyone who knows a little bit knows that this will happen at packeloss anyway.

I checked that the reduction in video resolution only affects Europe for the time being: https://www.heise.de/...86819.html

I can't say much more about it now, I don't know the subject very well. But such measures are taken so as not to cause too much overall packet loss in the network.

Youtube is reducing its transmission rates so that the European networks have more left over for the rest. I often view YT critically, but I can't imagine that a billion dollar company like Google would take such an "unnecessary measure". Or do you think it's a PR measure?

This is a measure under pressure from the EU. Starting from politicians who have no idea about technology.

The thing is, how much a forced quality lowering matters will depend on the subject matter. People might be mildly annoyed if their music video or cat video is in 480p instead of 1080p60… But it's still going to work just fine. OTOH, if you watch tutorials of any kind, where there is TEXT on the screen, having the quality drop makes the entire thing either difficult to follow, or completely useless.