That profile in particular is interesting. The first two tweets appear to be human originated, and date from December 2021. There are no tweets from the account until seven hours ago, and all the tweets after that point are spam.

Several options:

* Spammers creating accounts and posting human posts in advance knowing they'll be used for spam in the future

* Account sold by the actual owner

* Account compromised and repurposed for spamming

I bet it’s all three, but leaning toward more of the last than the other two.