Well, it was firstly advertised as free account with custom domain. I was one of many who created the account. and keep frustrating and maintaining another @gmail.com account for this reason.
That's not at all how it started. It started as a way to host your own domain for free and that's how they advertised and supported it. 10 years on they changed their mind but that's bullshit.
I was your guinea pig so you could perfect the service for business users, now that you're done with that experiment you want to hang us all out to dry.