IDC works on whole cast, completely one player based as well.
All it takes is one person to do it, the opponent can neither stop you nor prevent you from doing it, considering you both start on ground.
DDD infinite doesn't work that way. It's only on 5 characters, you must get a grab in, and for some, you also have to hit in between giving more room to escape. =/ It's not COMPLETELY one-sided as you can
A. Escape during pummeling
B. Super Grab Break
C. Stay near a ledge.
D. Counterpick places with lots of ledges like Norfair
E. Space well so you don't get grabbed.