CloudFlare tunnel with Zero Trust, plus their bot and abuse blocking. Users can get in with the right oauth, plus only allowed from the countries I know they're in. Then just their username and password on jellyfin.
They prohibit large amounts of media being streamed, and they reserve the right to suspend or terminate accounts for it. Multiple years in, that has not happened.
Cloudflare is known for being unreliable with how and when it enforces the ToS (especially for paying customers!). Just because they haven't cracked down on everyone doesn't mean they won't arbitrarily pick out your account from thousands of others just to slap a ban on. There's inherent risk to it
I hate the cloudflare stuff making me do captchas or outright denying me with a burning passion. My fault for committing the heinous crime of using a VPN!