Interesting. It could be that I never noticed before because I wasn't as active (and have gained a couple followers in the meantime, thus becoming a slightly more attractive target). In any case it's now bad enough to make me reconsider using the platform at all (that and the promoted replies and tweets by blue checkmarks). Related to your remark about reports: my last few spam reports got the reply that the tweets didn't violate the "sensitive content policy", even though I reported them as spam, not sensitive content. So something seems to be broken about the report system now too.