As noted, we don't have any evidence that this is a "fact". That people keep repeating it is, frankly, demonstrative of so much of what is wrong with the world. The inability to distinguish belief from fact, even by intelligent people, is a big problem.
So far we have two unsourced unsubstantiated claims. One from you, one from Hussar. You've claimed Crawford has claimed that most people don't use Feats, alluded to it being in a video somewhere, and given out a 30% figure. I'm certainly willing to believe only 30% of characters have a Feat once we take a lot of things into account (i.e. that most characters are under L10 being the main factor), but it's unsourced. Much more extreme is Hussar's claim which is that DNDBeyond suddenly changed the methodology of their data dumps and according to Hussar are now only including characters who have had XP added to their character sheets (presumably and/or been levelled up manually). It's entirely possible that's true. But it's an unsourced claim at this point and Google ain't turning up nothing on it. I can only find earlier stuff where that wasn't the case.