You'll find that these professions have a vested interest in maintaining network effects, and as such will view Mast/Blue as threats to their networking infrastructure. They don't want to dilute the importance of the platform their patronage systems rely on (let alone destroy it) - in fact its centrality is why they leverage it to advance their careers. Artists I can see understanding platform agnosticism to some extent, but for the other two groups, it's simply not in their DNA. The gatekeeping is a feature for them.
'The medium is the message' as a Canadian theorist once said.