There’s a limit, but they can still do damage to the system? Not something I’d want to use.
So this does not require root access? It’s only installed by the user and for the user?
Size should be the lowest concern. I run things from git and build myself and that requires a lot more than 200M. Probably multiple GBs.
Running as non-root users should be a major concern and/or area for improvement.
Most systems are used by one person but if you were to install a snap on a true multi-user system you could easily break things for other users and that would be very bad.
I install dmg files on mac as a user and most dmgs will do that. There are some that don’t install that way but they usually don’t get installed at all.
Not to pick on you and I think the idea of a snap is not terrible but if there’s still a chance for it to damage the system then the snap implementation is not complete or if it’s complete then it’s not proper.