Maybe that squid next door had him busted for having too much fun.
You know, Squidward has done some pretty cruel things to Spongebod in the past. Maybe he HAS kidnapped Morghrabi in an attempt to subvert the movement and claim all that attention.
Maybe Mr. Crab felt the attention Spongebob was receiving through Morghabi's movement was bad for the restaurant.
Or....maybe Plankton is involved. He's probably got Morghabi locked up in the Chum Bucket restaurant......