Its the pace of the games and the sports science etc, with football being more focussed on athletic ability,Straight up, I really don't recall this happening that often before like 5-10 years ago. Is it the absolute glut of games or something else entirely? It's so weird these kids in their physical primes are just collapsing/heart issues.
Players push themselves to certain limits as to be elite you need to be a robot, take certain supplements and some body's don't react well to it.
Its the same with pain medication or sleeping medication in most sports, its a big problem.