I strongly assume there are higher rate limits, more than once I've seen the Right Kind of Startup, (buzzworthy, ex-FAANG with $X00m in investment in a market that's always been free, think Arc browser), make a plea on twitter because they launched a feature for free, were getting rate limited, and wanted a contact at OpenAI to raise their limit.

Arc is an excellent example because AFAIK it's still free, and I haven't heard a single complaint about throttling, availability, etc., and they've since gone on to treat it as a marketing tentpole instead of experiment.