@scooke I believe I could install Plesk on multiple servers, but that may have changed.
Thanks for the discussion. My use case is multiple domains across multiple servers. Coming across cloudron via docker I assumed it would work similarly in that one can install it on multiple servers and run multiple domains on multiple servers as per the discretion of the webmaster.
I don't mind paying, I just thought of it more as the open source from which it sprung. So if I could run multiple instances of the "free" tied to my single paid license account - that would be ideal. I don't see a way to do that other than signing up a whole new email address if I want to "see" each of my paid instances. And I can't ever see my free instances on the cloudron.io site.
It seems the answer is that my use case is unusual. I'm cool with that, but if there is a way to add more than one cloudron to my cloudron.io account, can somebody point me to the process? Thanks.