I will of course grant that the existing system of top-down control entirely won the war. The main effect of the Agile movement at most places was fancy new labels on the same terrible dynamics. These days processes and tools (coughjiracough) have won out over individuals and interactions. But let's try to remember that intent was different.
[1] https://agilemanifesto.org/ and also read the principles https://agilemanifesto.org/principles.html
To be fair though, not sure how to turn a tanker without centralized controls.
I'm honestly not sure if they could have avoided the current outcome. It was always a pretty loose coalition. But I think trademarking Agile and setting down some strong minimum standards could have helped. But even that might have been washed away by Scrum's "certifying" anybody who could fog a mirror and the attendant revenue for people whose personal interest was in watering things down.
[1] http://agilefocus.com/2011/02/21/agiles-second-chasm-and-how...
Perhaps this is why I find agile terminology of Epic/Story/Saga/Sprint so infuriating when it is mostly used for same half assed frontend on a database crap repeated 10000th time for next microservice.
It is strange with so much rise in literacy and education people are still so dependent on fake praise for work done.