Wow. Theory has problems. Get back to figuring it out. Just launched into old breads and capped these.
Global notable response: BO & BV please explain. See cap of global notable >>6261140 states that .jpegs disappear. Phonefag anon (digger, check my hash) has decided to counter the continuing push for phonefags to download an "app" in order to change file extensions. I >>>>>went back to check theory again today. Went to board search. Picked random word not often used: "ulcer." Launch into several old breads. Check June bread. See caps below. In old June bread, it is a mix of files still showing. Some .jpg and .png files gone while some .jpeg files remain.
If board wishes to drive away phonefags with this app push and slights on .jpegs, theory should be solidified.
Will continue to dig and post and will go back to ignoring theory pushers until something solid is posited.
Anon has eliminated most apps and does not wish to add moar. Also posting in meta.
see >>6283539