I wouldn't call Rumble alt tech. And the content and U.I. both suck. Rumble is for normie (dumb) Republicans, just like Twitter is for normie (dumb) Lefties.
Try Odysee and BitChute instead.
The BitChute app sucks, so use BitSlide to access it.
Odysee keeps glitching but there is a lot of content there. And its search sucks.
BitChute is where all the really crazy stuff is.
If you just want to watch YouTube without ads, use NewPipe on Android.