Many reasons, and it depends on who you’re talking to.

I use LLMs for coding, as well as a few other minor things.

I do not like the corporate AI garbage slop being forced on an unwilling population.

I do not like the widespread anthropomorphism of AI.

I do not like the idea of fucking everything up with slop and hoping future models will clean up our messes.

I do not like hypercapitalists buying up land, water, electricity rights, while shitting on everyone else and the planet.

It is a complex and diverse topic. It is also very new to most people. Of course there is diversity of opinions.