I looked at the front page alone and it's full of right wing hot takes and neo-nazis. If a platform wants to accept white-supremacists that's one thing. When it's right on their front page though it's being actively promoted.
It's because the only valid argument nazis have for why they should be allowed to broadcast what they have to say is that (in most jurisdictions) it's not literally illegal to.
Rumble isn't going to save the internet.