"u are just greedy and jealous"

Ad hominem fallacy, used to discredit a claim with unsupported and irrelevant accusations.

"come up with ur own content that is worth upvoting"

Red herring fallacy, you change the subject with irrelevant suggestions. Having others upvoting his posts is not what mystead was talking about. It's haejin upvoting himself.

"turning this platform into some nazi censorship"

Godwin's Law. A lazy way to try making the other side seem bad by calling it something it's not but everyone hates.

"Here a free market is at work"

Even free markets have rules. If I hack your account and take away all your earnings, will you say it's free market, so it's ok?