A lot of the actual, serious ones that knew what they were doing got caught. Some went to lulsec to be jerks with no agenda and were caught by the Feds. All that was left were script kiddies that downloaded the Low Orbit Ion Cannon and used scripts they find online. Then they left or were overtaken by alt right idiots.
The original Anonymous are in their 30s and 40s by now. Everyone ages out.
That’s a really innovative idea, and solves a lot of transportation problems since phonographs were usually stationary in a house.
However, the size doesn’t fix the problem of carrying around 10" disks to play on it, so the setup is only as compact as its components. Still better than carrying around a cabinet, though!