Yep, Youtube reviewers make long videos so that they can earn $. My youtube videos are usually under 2 minutes because that's my honest opinion so I don't get paid for short videos.The reviewers make a living of this stuff after all. Who would watch their stuff if every video was 2 minutes long and they would just let you know that the current DAC they are reviewing sounds exactly like the last 20 DACs before that
How many people here replace their hardware every few months? Probably plenty , even though they should know better.
But that's all part of this hobby as well.
However, I disagree that dacs sound the same. I have 14 dacs (either standalone or in receivers) and here is the order of worst to best for 2-channels music (especially Apple Music lossless):
Amazon Echo dot (3rd gen) with clock ties with 4th gen
Denon Heos 1
Denon Heos 3
Denon Heos 5
Denon Heos 7
Apple Airport Express ties with Bluesound Node