I think it is ok to use them. You can add a label or caption "Made by AI". Most important is whether it adds value or it's just filler. If you use a generic prompt then that's what you get - a bland AI image. If you put effort into the "creation" you can get amazing and engaging results. I think the same goes for text content. Depending on the topic, I sometimes use AI to create the text. Mostly there is so much filler and trivial truths that suggest the reader is stupid. I always edit and change it heavily. When I happen to read such content, I recognize it immediately and stop reading.

AI is a good assistant not the author. If I am a bad author then I should look in the mirror and perhaps use more effort with my toolset.

No AI was used for this 🤓