I don't as such blame them for not wanting to do it for free, but they did want to do it for free until they didn't, and you could argue they're under no obliga

I don't as such blame them for not wanting to do it for free, but they did want to do it for free until they didn't, and you could argue they're under no obligation to keep doing so, but given the way they have introduced the change, I would be uncomfortable being a paying customer of theirs, too. What's to say they won't be trying to change the terms of their offering in other ways? And if so, why should I think they would get any better at doing so in a fashion that minimizes the disruption?