Epistemic status: much ado about nothing.
tl;dr: I look at people saying “I’d bet” on the EA Forum. I find that they mostly mean this metaphorically. I suggest reserving the word “bet” for actual bets, offer to act as a judge for the next 10 bets that people ask me to judge, and mention that I’ll be keeping an eye on people who offer bets on the EA Forum to consider taking them. Usage of the construction “I’d bet” is a strong signal of belief only if it is occasionally tested, and I suggest we make it so.
There are various levels of "policing", ranging from gentle suggestions (this post), occasional nudging, public shaming, coerced speech through some technical tweak on the EA forum, public flogging, or locking someone away and throwing away the key.
I think the lower levels are fine. The forum already has rules, some of them could refer to epistemics. "Be kind, stay on topic, be honest, offer an operationalization and stakes if you are offering a bet"