you using a VPN on the site, specifically. What’s going on is that the Lutris website uses Cloudfare, which does these kinds of checks on your IP when you connect. It’s partly so it can direct you to the best cloud server (through DNS I think), but if it detects a lot of users on the same IP address, you might get annoying captcha bullshit.

I found out from my VPN that I have to switch servers connected to and then i got on.

This and other information is available on the Internet and you can find it yourself. https://forums.lutris.net/t/lutris-doesnt-allow-vpns/15928

And other information how you do it. https://github.com/Milor123/Lutris-ZeroTier-Or-VPN-Wine