Yang wants to give everyone legal ownership of their own data. That is going to be more disruptive to the tech industry than antitrust rulings against a few companies.
What does that actually mean in practice? From a technical perspective, thanks to GDPR, Facebook and other sites now let you download your data (even outside EU), but it hasn't led to a resurgence of competition in social networks. From a legal perspective, you do own the content you provide to Facebook, you only provide them a non-exclusive license to use it.