I get what you're saying, namely to try to push down into obscurity content someone might deem silly or whatever. Two thoughts occur to me: (1) a big premise of Bitcoin and decentralization is "permissionless" which aligns with free speech. The question then becomes, "Who gets to say what's good and what's not. (2) "Downvoting with Sats" sounds like zapping negative sats. Sounds like saying, "Nope, that post is bad. Instead of giving that poster sats, I'm taking 21 sats away." Which, of course, isn't possible to do.