At first, I thought you built a justwatch.com clone. But, after a quick inspection I realized you solve a related but different use-case where the user already paid for the streaming service holding the rights to the media, but not necessarily match the user’s country location. By enabling the user to check in what countries the media is available you also unlock a new business model based on VPN affiliation programs…
It's been a few years since I've used a VPN with streaming, but I recall some services not working well with it. I was in Australia with NordVPN to the US on a fibre connection.
Netflix never works for me ('title not available try another one or again later' or something, on everything). I'm not even using it to try to change my country, wish there was some other way to verify that. (Or better, that licencing was such that they just didn't care, and nobody would need to use one to change country anyway.)