As they had to stop, they were no competition for Kodak before. The same with Agfa.
The topic cine films to me seems much overrated.
Each of those companies had a market share - that made them competitors. Significant/insignificant market share - that doesn't matter. Those companies had enough of a share to produce, then they didn't - but not because Kodak was the Champion or anything. The majority of the market vanished.
I mentioned motion picture films because, at 1 minute per 100 feet of 35mm film, a single movie uses a massive amount of film - more than most still photographers will shoot in a lifetime.