Gaiaonline did not have an account limit as far as I'm aware, you were allowed to have as many 'mule accounts' as you wanted. I had over 15 at one point (I thiiink I don't really remember, definitely way more than is reasonably feasible for the average teen to manage) simply because I liked making different characters to dress up with different themes and played with them like action figures lol.


...But I don't know if Gaia really counts as a 'petsim' per se. Even so they seem to be exception, not the rule. Everything else I've played that's not some sort of MMO has limited to 1 account and are quite firm on that.