hi so i want to use parsec on linux to play minecraft java when am not home but its not showing my streaming computer
That makes zero sense. Where did you get that idea from?
For reference, here are their docs describing key management. https://tailscale.com/blog/tailscale-key-management
You can trust them, but you shouldn’t trust any open source project by default, and it’s even more important in the context of big corporate software.