They’re bullshit generators, essentially - it doesn’t matter to them whether they generate something that’s ‘true’ or not, as long as it’s plausible. Depends what you intend to use them for - if you want a throw-away image for a powerpoint slide that will only be looked at once for a few seconds, they’re ideal. They generate shit code and boring, pointless stories, so couldn’t recommend them for that.

If you’re a D&D GM that’s in need of quite a lot of ‘disposable’ material, they’re alright. Image of a bad guy that you can then work into the story? Great. Names for every single Gnomish villager? Great. Creating intricate and interesting lore that brings your world alive? No, they are not actually intelligent and cannot do that - that’s the part that you provide.

At the moment, huge amounts of venture capitalist money is making these things much cheaper than their true cost. Can only imagine the price of them is going to go up a lot when that runs out. You might not be able to afford the subscription, but you’ll be in good company soon.