My understanding is that it was always about creating a kind of protocol for engineers to collaborate better. and scrum just packaged those concepts so they could be implemented by anybody. The bureaucracy happens because it's usually not owned by the contributing team and instead orgs like to synchronize all their teams into one unified process, so it inevitably becomes "corporatized".
That's the theory. In practice it became a way to cargo cult those things with bureaucratic rituals.
This was completely the fault of scrum for being highly proscriptive about the process. It's like teaching somebody to program with rote learning or something. It just fundamentally doesn't work because the core of the process requires human ingenuity, creativity and freedom to work and by having a rote process those things are inhibited.
It invented a bureaucratic way to cargo cult them though.