I'd be shocked if more than 10% of the people investing in crypto on Robinhood know what a stable coin is. I bet a fairly high percentage of total crypto investors (not by amount of crypto, but count of individuals investing) are on Robinhood. I'd expect that other casual-friendly trading platforms with crypto support are similarly skewed toward people who don't know much about the space, though probably not quite as much as Robinhood is.

Oh, the OP said “crypto speculators” which in my mind is a bit more involved than random dudes buying Doge on RH.

buying doge on RH is the most obvious accessible kind of speculation.

You'd be very, very surprised, then. I would wager probably at least 60% wouldn't even be able to make heads or tails of the term "stablecoin", and possibly up to 80% or 90%, even.

Sometimes crypto investors do their investing through means that can be several times detached from the nitty and gritty (e.g. would buying COIN or MSTR stock be considered crypto investing? Some say it would) so it doesn't surprise me that much. I don't think it's too healthy, but hey.