WotC wanted their cake and to eat it too. They wanted what is essentially free promotion, but also control.
The fact that folks were willing to screen-scrape videos rather proves that anyone who is trying to make a commercial go of creating content, but does not exert control on how it is released, is being dumb.
The compensation model for promotion is irrelevant - free or expensive - if you are trying to sell content, you need to control that content. This is not somehow a character flaw of WotC - it is the world we are living in.
They wanted to weaponize FOMO to drive subs, but "not like that!"
It's too bad people like giving them money so much.
WotC has done (or tried to do) some crummy things.
Adapting when they realize that folks on the internet are willing to screen scrape videos is not one of them.