[fauigerzigerk]

That's exactly what worries me. So if something is done to prevent growing market concentration it better be something that doesn't rely on this sort of fine grained market segmentaion.

One alternative that could work is to mandate open APIs and a requirement for large platforms to carry all legal traffic and content. I know this is incredibly tricky as well. Who pays for the infrastructure? What about security and privacy issues? It raises many questions but it seems more promising as a direction of travel.