I wouldn't expect consumers to even be aware that API keys exist, much less know the pricing differences. When I go to the Google One plans page, it just says I get all these AI things with higher limits. Then there's some tools that can use my account to do cool stuff. I wouldn't expect that a program that's logging into an AI service that I pay for as me to do AI things is it all untoward? No more than running a bot that just did high level control and delegated to their specific program (which is what all of this AI stuff and really software in general is about: automating whatever you're doing). Or when I give codex an auth token to use Jira or Gitlab. I expect that's the intended purpose of the auth token: let me perform whatever actions I need to do that I'm authorized to do within whatever limits the service sets.

Literally the entire buzz around all this AI stuff is that it lets you automate stuff and do more things faster. Why would you not expect people to automate their interactions with the AI service itself? AI automating its own interactions with itself is what all the AI companies are pushing as the immediate future and paradigm shift for everyone to hop onto.