Just move the accounts to the free version of "google cloud identity.
It's my domain and I'm the admin on G Suite so it's just as much my personal account as any gmail account, and to follow your logic then you basically shouldn't use any kind of 3rd party service or cloud account.
>I realize people started using them like that
Perhaps that's because google advertised this as way to get a gmail address with a personal domain, offered a free basic tier to everyone that wanted, and rolled out support for all their products to use these accounts with them, without, it seems ever considering the eventuality of charging for the free tier and thereby holding accounts and data hostage in away they'd never consider for normal accounts.
But I guess that makes it harder for you to feel superior
"Google Apps
For individuals and small teams
Free"
https://web.archive.org/web/20120602004504/http://www.google...
That's totally true but only if you are an employee, the business owner should have total access.
I don't see how a free GSuite account - where you are the business owner - is any less yours than a free gmail account.