To what extent is the success of broadcasters avoiding butthurt by using DMCA takedown notices due to the original posting party’s inability (because of bad information, lack of counsel, lack of financial means, etc.) to assert their rights under DMCA to contest the takedown?

And to what extent is it due to the posting party’s simple lack of a good factual basis to contest it successfully? That is, they really were violating a copyright.

Educated guesses would be edifying. Thanks in advance.