If you suspect AA for spreading CSAM, please don't support the project. And please do share your reasons for suspicion.

This isn't TOR, though it's not completely unfounded that the definition of CSAM could be broadened in the future by legislators to include things that are, by current definitions, not CSAM, e.g. works of fiction that include scenes of abuse.

Yes, your copy of your operating system could also contain CSAM, I hope you checked every single byte just to make sure.