It's pretty good at giving Wikipedia-level summaries of things with Wikipedia levels of accuracy. (Which given its training data should not be surprising at all.) This is reasonably useful, and something LLMs are quite good at.
I mean I've not done a thorough investigation but it seems fairly okay at this, which again shouldn't be surprising given how many cooking websites it's no doubt scraped.
Personally I've had success with even pretty complex math and physics problems. It can do fairly complicated systems of equations and integrals for example. However I highly suspect it's actually just plugging into Wolfram-Alpha or similar here and using the text conversation more to convey the results.
This seems to me to be by far the biggest use. The more code you write the worse it gets, but for writing adequate code that can do a small task, which is then integrated into a larger program, it's quite good.
Of course we live in a Capitalist society though. How does ChatGPT convert these things into revenue, specifically $1-2tn of revenue?
It doesn't. Coding is the only place I really see it really making an impact, and that's also something that involves a lot of back+forth queries. At 1¢ per query, costs start to add up pretty quick. (That's 20-40x higher than a Google search, for reference.) Nothing about paid ChatGPT is especially compelling to an average joe. Ooh I can play around with higher resolution images, fancy. No that's not worth $10 a month unless you're rolling in it.
Unless they're somehow able to turn a text prediction model into an AGI within about 2 years or so the only place OpenAI & Co are going at this rate is bankrupt, that much seems pretty clear. The whole gravy-train is fueled by a mix of venture capital hype and a game of hot-bag-of-money between OpenAI, Google, Nvidia, Oracle, Microsoft, etc. If one of them can't pay, all of them can't pay and there goes ~25% of the Dow and your nan's pension. It's not like the telecom bubble either where sure, we spent all this money for not much returns and everything went to $#^@ but now we've got all these fiberoptic cables that are good for many many decades. Any GPUs bought from the current boom will be snails in 10 years time, if they're still working at all.