One thing about the Disney's
Snow White is that Disney had to mortgage his house and borrow money to even get the film made. All the while people were poo-poohing the idea, calling it "Disney's Folly". So, it was a
big risk, almost as if people were expecting it to fail. The movie was a hit, but it was followed in 1940 by
Pinocchio and
Fantasia, both of which were not box office successes, at least initially. So, the "commercialization" idea is a bit overstated, imho. Disney was not then the juggernaut it later became, and if
Tolkien thought things were commercialized
then, boy howdy...
My opinion about the movie is that it basically tested the waters for feature-length animation, a significant first for the medium. I don't think it's a great film; there is a
lot of filler packed around a threadbare story. I can possibly see where Tolkien had issues with it. But I find it pleasant enough. One thing that the movie possibly introduces, that later became a subject of some controversy, is that the Prince kisses Snow White while she is in her death trance. In the version of the story I last read, the Prince lifts her casket and the piece of poisoned apple she ate gets dislodged from her throat, causing her to come out of her coma. I guess Disney opted for the change (if it was indeed their change) because the original was either too silly and/or hard to convey on film.
After the initial financial success of
Snow White Disney perfected the form, even if not always with the desired box office results. I happen to think Disney's
Pinocchio is brilliant and a marked improvement over the original Carlo Collodi story (would anyone really want to see a faithful adaptation of that, with Pinocchio actually being hung from a tree by the Fox and the Cat)? Guillermo del Toro came to the closest to that in 2022 and even that was softened somewhat from the original tale. I also think the Disney version of
Peter Pan is also a big improvement over the original James Barrie book, which I honestly found nigh unreadable. And, of course, Disney didn't just adapt fairy
tales. There are quite a few movies of other genres:
Dumbo,
Bambi,
Lady and the Tramp, etc.
Anyway, I'm not questioning Tolkien's dislike of Disney product. He had a his reasons and I'm sure they had merit. But he was also a bit vague about his displeasure (as he was about other things) so I'm sure I would disagree on various points. One thing that is certain is that Disney would unequivocally be the wrong company to adapt Tolkien, something Disney evidently agreed with, according to the video
@Aldarion posted. It would not be feasible in the least.