My guess is they are getting folks used to the idea of:
1. The end of unlimited token subsidization and a new status quo of metered usage limits.
2. Adding to the above, self-initiated usage limit resets give you some control and again help lessen the sting of the end of subsidization.
Right now though, I think Anthropic and OpenAI are in open MAU war ahead of their respective IPOs and that might be a bigger factor.