There was and still is a very nice competitor in this space called PlasticSCM. They were bought by Unity a few years ago. Unity has not been a good steward. They should have done what Epic is doing and open sourced it. But instead they chose to give it P&L responsibility. Curious what it's contributing to their financials.
Seeing PlasticSCM wither like this is sad. I had rather high hopes for this system to successfully compete with Perforce, but history worked out differently.
Plastic is usable on surface, but doesn't scale well. If you've ever looked at what Plastic does when you use its git fast-export compatible feature, the results for merge commits are horrible to behold, e.g. delete of a directory followed by add of a file into same dir, then delete of it then rename.
I’m not picking up how its git export feature maps to its scalability.