as unity slowly vanishes, and unreal continues to breed unease in pursuit of the least sound impulses of tim sweeney, i sort of think valve could nigh-effortlessly clean up here and make the world a somewhat better place.
just shit out source 2 with source code access and an extremely permissive license and forget about it. approach support the way valve always has: mostly don't do any. this is perfectly competitive with every engine besides unreal. nobody trusts a big company, but everyone trusts valve not to make any sudden movements. and there should be more than one viable general option for game dev.