Does Netflix get more expensive the more devices have access to the account?
No:/
The number is limited, I think it depends on the type of subscription
No, there's a price you have to pay monthly
No, it depends on the subscription. Depending on the subscription, a different number of devices can stream at the same time (Basic 1, Standard 2 and Premium 4). The number of devices that can be accessed (time-delayed), however, is not limited.
Yes no…
there's a tariff for two devices 12 or now 13 euro
and one for four devices… It costs 17 euro
the content is identical for both… Only the number of devices differs
So my brother pays 15 euro for 4 acc and I think you pay less for one but I'm not entirely sure