What an uninteresting answer. People are interested in the technichal details, come on.

Haha, sorry. But actually it's pretty much it. You need VPNs to check catalogs in different countries, which is tricky for some services (like Netflix) as they try to block VPNs. So you gotta always have a large pool. Catalogs of services like Prime Video is just there without an account but for Netflix you need accounts to see the catalogs (and not to send too many requests otherwise they block you).

Rest of it is just writing some regular crawlers.

Cool, thanks for expanding and congrats on the project!