I think it's due to the little guy making a huge wave that other people don't feel they're "allowed" to make. These other devs work on "AAA" companies working on big name titles from studios everyone has heard of so. But now a small, indie studio comes along with a grand slam and they don't like it kind of makes them look bad by comparison. Showing you can release a big complex game without it being an absolute buggy mess, doesn't need microtransactions, doesn't need to sell millions of copies to be considered a success, and isn't just a copy paste of the previous game with a handful of modifications made to slap a new "FOR SALE" label on it...