My ads have gone from mainstream brands to dregs, degens, and grifters. This doesn't seem great, unless Elon's intent is to replace advertising revenue with other sources.
I'm still getting the same tech company and video game ads. Haven't noticed a difference. I block all the accounts that are ads but even then I still get ads from mainstream companies I haven't blocked. Theres still plenty of companies advertising. I have yet to encounter anything sus apart from some rando paying to promote a meme or shitpost.