Well I'm very annoyed. It's not that I might have to pay for a service, it's the unfairness of it. I've several friends and family members up with accounts on my domain to be nice to them to make life easier for them or because they were too poor/techy to set up something for themselves.

I also have a few hacky things set up using free email accounts on my domain, because why not.

Now Google want to charge me cash for their accounts after I've done some free marketing for them in getting people using the Google ecosystem. They don't seem to be providing me with any help to get them transferred to a free account. It will cost me either a lot of money or time and/or social capital to solve this.

This is an enormous price jump from free. The free Google Apps or whatever it is had up to 100 users. If I had 100 users, that looks like £50 per user per year on their cheapest tier, so £500 [edit: £5,000!! - thanks, @alias_neo] a year.