This is actually a good thing. Let me explain.

If there is a market for domestic video-based social networks, then it should be low-hanging fruit for a US-based provider to offer a competitive product. If there isn't then the market has spoken, and consumers have voted with their attention.

There aren't any other interpretations that don't deprive the invisible hand of the market from delivering providence to consumers. These are rational actors making voluntary choices. Foreign policy should simply stay out as any intervention is necessarily a market distortion. If market actors are consuming it, it's good definitionally.