Earlier quoted context omitted.
DMCA isn't the thing allowing this, its big companies taking dmca notices at face value and just acting on them without caring.
The DMCA forces them to act this way.
Consider wikipedia which regularly rejects most [1] of the dmca notices it gets because it cares enough to actually read them and ignore the ones that are bullshit.
[1] according to https://wikimediafoundation.org/about/transparency/2023-1/dm... in a 6 month period they got 29 dmca requests and ignored 27 of them.