For modpacks, not really.
A mod/modpack might run just fine when you started to use it. But it can brake at any time. Cause the more you use it, the more RAM you need, and since aternos has a RAM limit (Cant rly complain, its free) then it will eventually give up and start to crash.
This is frustrating. Why do you offer modpack installation to begin with?
I appreciate the free server hosting, but there's no point when people can't maintain a solid connection.