Using a single free docker for a personal project would require me to rewrite how I deploy stuff for my personal projects.

It is much easier/saner for me to stick with git pull && docker build. If my SSH install isn't secure, I'm screwed anyway.

If I was seriously considering switching all of my containers to Service X, rewriting it would be trivial and just a cost of doing business.

agreed. next stop - trusted builds. I'll announce you'll sign up?