(But even if the account doesn’t go idle: I think there’s a significant difference in kind between a company’s account being generally active and paying for advertising to appear next to increasingly extreme and negative content.)
Sponsored content would be side by side with (last time I checked) crypto scams and porn. There's actually a risk of devaluing your brand by promoting it alongside tat.
Are you saying X/Twitter doesn't let you choose whether or not your ad is displayed with adult content? Or doesn't let you choose content categories to run it against or not?
I thought most advertising platforms let advertisers choose which content categories to run (or not run) the ad for–e.g. "I only want this ad displayed on content related to motor vehicles, fishing or firearms". Or even keywords – e.g. "don't run this ad on any content mentioning [competitor_name]"
A random person outside of HN mightn't consciously notice anything, a marketer absolutely will and they'll notice how all these kinds of factors will impact the efficacy of a campaign actually increasing sales rather than just being viewed