Tesseract (t.lemmy.world) both badges and lets you filter new accounts. You can configure the number of a days an account is considered “new” from 1 to 30 days.

In the upcoming release (delayed due to personal issues), you can completely hide content from new accounts (versus just collapsing it).

Additionally, (in the upcoming release) it will automatically hide content from users less than a week old who have deleted their accounts. This feature is a direct response to this “hit it and quit it” nonsense from the accounts you’re describing.