They are not interchangeable though and that's the crux of it. When a service like this tells you you're eligible for using their product for free and then boot

They are not interchangeable though and that's the crux of it. When a service like this tells you you're eligible for using their product for free and then boot you off their service, they are potentially leaving you in a worse state than if you had never used their service to begin with. It's hard to express how benign most of this is and I'm not trying to oversell the damages, but there is potential for it to be bad and thus at some point there's a responsibility to your users (that champion your product and give you indirect value) to do at least the bare minimum of giving them an email or something. It certainly takes less time for netlify to send an email than it does for their users to change platforms.