I'd rather recommend the safer alternative, which is called teasers, but unfortunately, they're not available in any of the crypto sportsbooks that i've been using.
I’ve noticed that too, a lot of sportsbooks no longer offer some of those niche markets that used to be fun to bet on. Makes you wonder, right? Maybe it’s because too many sharp bettors were actually winning on them. Bookies aren't in this game to lose, so if a market gives bettors even a slight edge or has a higher-than-expected win rate, they’ll quietly remove it or limit it. Instead, they’ll keep pushing the markets where the house has a edge and where casual bettors tend to lose more over time.
I don't think the reason is the number of players winning. As you said, niche betting brings little profit. Clearly, bookmakers aim to make as much profit as possible by offering non-niche products.
No one bets to lose. Even with impossible odds, they still have a chance of winning, don't you think? Remember, the house always has the edge in any situation; otherwise, there would be no point in existing.