So what does this mean in the context of other things? Can users block other users as long as they are not politicians? Can politicians report/flag tweets to

So what does this mean in the context of other things? Can users block other users as long as they are not politicians? Can politicians report/flag tweets to have them removed? Can companies do the same to eliminate negative tweets about their brand? Can companies/politicians pay for positive tweets to make up for negative tweets? Genuinely interested, since I am not a lawyer.