How can NETFLIX produce so many series?

NETFLIX is teeming with in-house productions. I find that inconceivable how NETFLIX can cut out so much content as a young company, while other film studios produce a few films a year. Where does NETFLIX have this infrastructure and who produces, writes and films all this content?

Netflix has 148 million paying customers.

"Where does NETFLIX have this infrastructure" - you use already existing infrastructure in different countries.

"and who produces, writes and films all this content?" - The producers, authors and teams.

The company is unlikely to entertain its own movie studios and pay actors, but hires a variety of independent film producers who deliver. As with Amazon and many other companies, the products offered are not self-made.