> I've also heard (though never personally seen, nor do I want to) that BlueSky has a CSAM problem.
There really isn't, unless you mean anime content(of both SFW and NSFW alike) by "CSAM". In case you mean by that, then there is, otherwise no. It also appears to be highly locale dependent - some say they see timeline filled to the brim with fetish furry images and male gay nudity dressed with right wing politics, but my timeline is like just Twitter 2014 stuck at 3AM without any of those. I don't use any filters or blocklists, the place seem naturally nice-ish.
> about how X was full of bots
They appear to have largely given up and scaled back efforts to replace existing social graphs by funding African/Middle Eastern/Indian/South Asian content farms under the guise of revenue sharing programs, burning out talents west to east, likely with the conclusion that they're all equally incapable of understanding contents posted on Twitter even without the language barrier, let alone gaining popularity and even with literal algorithmic manipulations. Or they just burned through quite a deep talent pool globally.
That effort started after Twitter was bought, beginning around South Africa or Nigeria. So it's not an improvement, unless you count someone ceasing hostility as an improvement.