I think I'll just keep using tailscale until they start enshittifying, and then set up a Headscale instance on a VPS - no need to take this step ahead of time, right?
I mean, all the people saying they can avoid any issues by doing the above - what's to stop Tailscale dropping support for Headscale in future if they're serious about enshitification? Their Linux & Android clients are open source, but not IOS or Windows so they could easily block access for them.
My point being - I'll worry when there is something substantial to worry about, til then they can know I'm using like 3 devices and a github account to authenticate. MagicDNS and the reliability of the clients is just too good for me to switch over mild funding concerns.