You could use proton cloud storage to do 90% of the same thing you just would have to have local editors installed

You could set up a docker with an exposed port for connections to the MySQL database server and run 20 databases inside it, that will come with its own risks fyi. You may have MySQL version mismatches to start with, you may have concurrent connections trying to use the same internal port, you may have a number of different situations where reads or writes take a much longer time due to other services wanting data.