There is already gridcoin which is a cryptocurrency that awards boinc work, so I’d say this concern has already been addressed because of that.

xpra: it is like tmux but for X windows (works on wayland), but it can do much more than that. You can seamlessly run GUI programs from a container or VM on your main desktop while still sandboxing their X capabilities, forward windows from Windows desktops, and it has efficient encoding so it is usable over poor connections as well.

I do something similar with rclone and vultr’s s3 service. I made an s3 remote in rclone and then a encryption layer remote on top of that.