I don't have an estimate, but I think it would be extremely significant. I think the most important factor from a competitive point of view is whether this is something that a platform would be endeavouring to do by itself, thus falling behind in the competitive marketplace, or is this something that would happen collectively?
I'll give an example that has been playing out in real life. I believe the European Union now has a regulation that requires platforms to at least offer an option for a chronological feed instead of an algorithmically curated feed. It's not that big a deal to just offer that as an option—most users do choose the default—but that form of regulation then creates a level playing field so that all platforms would have that as an option.