I have noticed a disturbing trend regarding youtube music videos

Over the past 2 - 3 years many “live” music videos are being claimed by individuals and posting on facebook.
Years ago, almost all songs had the original live version for viewing.
Today many of those videos are not available to the general public.
The songs are still available, but only with a still shot of the artists or a picture of the 45’ record.
What do these people get out of locking a large cohort of the public out of the pleasure of viewing original content?
A lot are also locked away via copyright.