Griner is a high profile individual involved in a political exchange, that unequivocally violated the law trying to smuggle contraband over the border. Countries make their own laws [sovereignty] even if we in western countries don't agree with them or the penalties attached. There is a (very small) chance I suppose that Russian officials hold every American in the country hostage for more political exchanges but that type of escalation is unlikely, DeAngelo and other non-NHL hockey players would not be high profile enough to make the juice worth the squeeze, and it's largely a red scare situation to try and indicate he or anyone else is facing any real danger.