Nothing prevents you from doing so. The power to persuade others to comply with your wishes is gained on Hive by accumulating tokens. That is the sole power HW has.

In truth no one has the power to ban anyone on the blockchain except 17 or more of the top 20 witnesses, who can fork the chain to remove anyone or anything they want, because code is infinitely mutable.

Communities and front ends like Peakd or Hive.Blog can mute accounts, but not ban them. I do not think that muting extends to their votes, and even muted accounts can up or down vote posts and comments across the blockchain. If that isn't true, I would appreciate being apprised of what is factually correct. Having witnessed a variety of flag wars since May 2017, I have witnessed muted accounts doing that, and believe it is still how the blockchain operates.