Along with all of the other good reasons already mentioned for not using a social media or third party login account for the apps I develop, I have one another one.
I don't do social media. At all. None.
I have several google accounts, yes, for various professional reasons but they do not overlap and I can't even imagine wanting to use one of those for a not-directly-related app or use. Do I find it a bother? No. I find it comforting to keep things separate. The sorts of apps that I develop for my own companies' clients and for other companies value security and accountability over (marginal) convenience.