Blackjack doubling after split: why are some games restricting this?

Noticing lately that more blackjack games, especially the live dealer streams, don’t let you double after splitting your hand. I used to take that option for granted but now it feels like a perk whenever I stumble on a table where it's allowed. Makes a huge difference for basic strategy, especially if you split eights or aces and pull a low card. Cutting that out just boosts the house edge, right? It sort of feels like a quiet way to nerf the payout rate while keeping all the same flash.

Is it really that much of a threat for the casino if people double after splits? I get it if card counters are abusing certain rules, but honestly, it just feels like regulars get punished for playing properly. Anyone else noticing certain studios or crypto joints cracking down on this lately? Trying to get a sense if it’s a wave across the board or if I just keep picking the wrong tables lately.