But a much easier argument against sports betting is that it ruins the sports. Players throw. They get good at subtly cheating. The gambling apparatus latches itself to the sport, to the teams and players, the umpires and judges, the sporting organizations. With this much money on the line, it's not a matter of if but when games are thrown, cheated -- the bigger the game, the bigger the incentive. It's even easier now because of the amount of side/parlay betting that is available. It exhausts the spirit of competition.
Sports gambling is diametrically opposed to sport itself.
I'm not putting up a straw man - I'm actually in favour of it. I agree that all forms of gambling ruins lives. We would improve society if we agreed that all gambling is bad.
As for speculation around the "real" economy, in most cases it is widely talked about as the mother of all evil where in fact, the best way to increase the market value of a company is to turn it into a better company. And on the other end, companies go to 0 because they go bankrupt, not the other way around.
My point is that we are denying the entire market structure to punish the < 1% of bad actors, while it is quite useful for the rest.
Crypto is a different beast entirely. I have never believed in it and I still fail to see the value.