[wolvoleo]

I would guess they only take action when they get a DMCA complaint and that wouldn't happen if you only share privately with friends.

[inigyou]

They can also take action if they decide you're wasting their bandwidth or (especially) cache space. It's not allowed to host video files on any free cloudflare plan due to cache space.

[busymom0]

I believe if you are storing the video files on their R2 storage, then it's allowed.