They are very good they exceed the capability of many humans in many tasks. If consume energy = bad for environment then all electric vehicles are bullshit cos they have energy inefficiencies that petrol cars don't (thermodynamics is a bitch). U do realise the argument about if asking an ai to create an image is art argument is literally the same argument that was had about if photography is art.
Llm are decently trustworthy especially with chain of thought reasoning and tool capabilities. And they are extraordinarily useful people wouldnt be using them and creating a market for them of they weren't. I can't train my brain then share it for free to everyone on the internet to download I can with an ai tho.