One of the best uses for GPT right now, before the door is slammed shut, is using it for bootstrapping services that require a lot of text content (using GPT to solve some of the chicken or the egg / two-sided momentum problem early on).
If you wanted to jumpstart a competitor to Goodreads for example, GPT can do elaborate book summaries and character discussion (etc). Use that to get a foundation of content (so the first users don't arrive to a nearly empty shell of a site).
This won't be possible for much longer, and bots like GPT will become drastically more difficult to build (regulation, content restrictions, et al.), and also likely more expensive to utilize for valuable purposes (they'll maximize its commercial value, once they understand fully how to bracket all of that and extract properly). GPT got out of the barn before the door was closed (before most realized the door was even open), a few more might make it out before the vast web of restrictions set in (whether content services like Reddit & Stack trying to block use for building services like GPT, or big media empires doing the same, or image/video owners trying to preserve the value of their works, or governments regulating, and so on).
GPT is in the early wild like Uber was, before governments around the world locked down on that premise, which created a captured market in many locations (whether by Uber or a local competitor that beat Uber there). That open situation never lasts. And when other (financially interested) entities see something like GPT's commercial exploitation potential, the barriers go up, they all want a part of what's possible. There won't be many GPTs in fact, for the exact same reason there aren't many Ubers. There will be a few prominent generalized gigantic bots/services that were early (were able to be built up before the lockdown of content access & consequences changed); and then there will be a lot of highly focused, niche bots that splinter the market over time and do more narrow things extraordinarily well. It'll also sort of follow the search market in this regard.