Have all those members I listed who are engaged in little more than downvoting other members been removed from the Steemit platform?

That's the beauty of the blockchain. Nobody can be banned. Nobody can stop you from sending or receiving direct transfers or delegations of steem.

Your bank can flag you and freeze your account (real cash-money-dollars) at any time and for any reason, they don't have to explain it to you and they don't even have to charge you with a crime.

Pa.ypal can also kick you off their platform (permanently, they have your ID) and freeze your funds for 6 months and nobody can even ask why.