Most real estate listing using a type of "HDR" exposure stacking due to the difficulty in taking photos of rooms that exposure the interior correctly and also expose the view from the windows in the same photo. It doesn't show things that aren't there, and personally I see it as acceptable, but I could see some law accidentally making it illegal.
Obviously not, though they may count as misleading image manipulation, and should be similarly regulated. The problem is subjectivity - AI is just a convenient bright line with an easy definition.
I'm not sure the line defining what you would consider AI is actually all that bright. Sharpening? Content-aware fill? Seam carving? Style transfer? How would you define AI to draw the line where you want?
I'm sure soon enough dating apps will get smart and instead of the "you have no matches" they will make some fake AI matches so you have a feeling that something is happening and you have a chance of actually meeting someone.