I would pay for a lot more things if I could do it anonymously

Cryptpad has Forms. You can choose if users need to sign in. Looks like you don’t even need an account to create one on their official instance. It’s self-hostable too.

At 3:30: https://ignite.microsoft.com/en-US/sessions/GS06

OBS is much crappier on linux than on windows, due to no AV1 encoding support.

OBS supports AV1 hardware encoding on linux with

• QSV (Intel) since 30.0
• VA-API (AMD/Intel) since 30.1
• NVENC (Nvidia) since 30.2

Software encoding has been supported for longer

There is a fork of Firefox Send

https://github.com/timvisee/send

If you already selfhost Bitwarden/Vaultwarden, you can use Bitwarden Send too.

I think they still haven’t officially released it, despite promising years ago. There are community projects like HoloISO