The problem is in scale.
YT gets about 7200 hours of content uploaded per day. That's 300 hours per minute. Of everything.
Full30 is about 0.01% of that. It's content-limited, too. And poorly indexed. Rumble is starting to improve, but it's suggested feeds is pretty thin. The notification system is also atrocious, too.
The content creators echo this. Many of them echo their YT videos to other platforms. They can get 30,000 views on YT, and 3 on Full30, 30 on Bitchute, and 0 on Utah Gun Channel--and those are "big time" folk like Forgotten Weapons and the like, with millions of subscribers.
Until those numbers start reversing the "others" out there are going to be Cable Access Channel G.
Also, much is made on YT "censoring" content. The problem there is that YT is a giant Hydra of a beast. Remember that 300 hours per minute? Humans cannot monitor that much traffic. So, automated programs (e.g. "bots") are used, that and the Report function. Use a pile of spurious log-ins and Report a channel 3-4 times a day for a couple weeks, and the channel will be downed, by the bots, even if it's "Knitting for Hamsters."
Current metrics are that YT has around 15 million lines of code in about 150 modules. The under-paid coders use bots to change the other bots. There are conflicting whitelists and blacklists. This is also why making "an appeal to a human" is often pointless, they are at the mercy of coders who are faced with finding the eye of a needle in acres of haystacks.