I agree with ajl in general, safety is important.
I’ve been riding ATVs since when they only had three wheels. Suzuki had the first four wheeler on the market in 1986. I enjoy it. I’ve broke some bones doing it. I’ve busted up a couple bikes pretty good too. It’s probably been since around 2000 or so rev limiters came into common usage. I don’t like them, but I haven’t removed any yet. But I also don’t play in deep mud, although I do like snow. Where I’m at, the snow is wet. Once you run out of ground clearance, the ATV is pretty much done moving on its own accord on tires.
If a person has the skill level and specific usage to not need all of the nannys or to otherwise modify a bike, myself I say go ahead on it so long as no one besides yourself might be impacted by doing so. Keeping in mind many of us have others that depend on us.
That said, here’s a link to a YouTube video as to how to disconnect the diff lock rev limiter (pull pin 14 out of the ECU).
KQ Diff Lock Removal - Pin 14
I just did a quick Google search to find that. I’m sure there’s similar for the reverse rev limiter. IIRC, I’ve seen both discussed in years past on this forum as well.