As someone that actually does these review videos, I can say there is only so much time I am willing to put into doing one.
I spend up to 3 hours recording the actual footage (depending upon the features of the meter, plus whatever playing around I do before hand to learn the meter a bit), then at least two to three times that time to edit it down to something more concise, and even then the videos are still usually over 30 minutes long.
It is a LOT of work, and whilst I dont mind doing that so much for a higher priced meter such as a Fluke or Keysight as the value of the meter makes it worthwhile (plus I would not be selling one of those afterwards), the budget meters are hard to justify committing that much time to, yes I still put a lot of time into those reviews, but if I can only sell the meter for $20 afterwards (as I have no need for budget meters), I don't want to spend 3 days making a video for it, plus the final video would be WAY too long for the target audience, people looking for a budget meter are not going to be interested in the finer details of edge case usage, sure that may be the case for higher cost meters though.