This tendency towards decentralization you're seeing is an illusion. Open-source doesn't change the fact that you need compute and the compute isn't decentralized. It's highly centralized in extremely expensive (both in terms of resources and energy) server farms. Even if content is decentralizing out of Hollywood it's still physically centralized.
Also, this tendency towards content decentralization will not last. Right now the whole AI industry operates at a loss because they don't expect profits, so small creators can use these tools because they're artificially cheap. Every company wants to capture market share in the short term so they can profit at a later point. Eventually they're going to want to profit and costs for content creators will skyrocket... and they'll just stop using it. Then the whole thing will crash.