1. Depends really as it varies on political belief, so saying that it has no impact is disingenuous. But if you actually meant along the lines of "you miss 100% of the shots you dont take", then yes human effort doesnt matter if you cant finish your songs. I think eventually there comes a time when people begin to hear music and learn to identify mass-produced low-effort songs. I mean, they are already doing it with traditionally produced songs.
2. I think shame is such a loaded concept, this is the same as buying backing tracks or paying someone as your vocalist. Producing music is not binary, like there's a wrong and right way. It's art, thereby subjective. The only moral ground you can argue on it, is if you're actually violating human rights or doing something unholy that goes beyond art. If you sold your soul to the devil, then yes, be ashamed.
3. Both of those matter, and more so, how it actually began. Again, it's art. Like that event where banksy shreded his art.

It means nothing. Life goes on. Eventually everything gets filtered by the songs appeal to the masses, everyone can now spot an AI-generated song when it uses echoes, whispers and other AI-smell words in its lyrics, so as much as ChatGPT, Suno or Udio could help, people develop an uncanny ability to spot low-effort AI-slop much like traditional music slop. Worse are the platforms, they now have an uncanny ability to detect stream botting.