The bar for a valid DMCA claim is very low. While it's definitely the case that frivolous, non-valid DMCAs get taken at face value and treated as valid by some

The bar for a valid DMCA claim is very low. While it's definitely the case that frivolous, non-valid DMCAs get taken at face value and treated as valid by some companies, fixing this wouldn't fix the underlying problem since filing spurious valid DMCAs has almost no real punishment, since no one has been willing to actually litigate to punish people doing it.