If the descentralization of social networks continue, we will have to prepare for the eventual rise of the instances wars, where people will start to fight about which instance is better and which one is weird to be in and so on, but that's for the future of us all.
Hm I have made at least 3 gmail addresses and didn't have to do this. And in fact their apps support account switching pretty easily, which seems to indicate that they don't really disapprove of making multiple accounts.
In fact the only thing they asked for was a backup email address in case you get locked out or they need to send security alerts, and that was optional.