when you download an image from the web these days, instead of a PNG or a JPEG, you get one of these new formats which is 8% more efficient, not compatible with any "pre-covid software" and has a name which sounds like

JEG
WebUP
High Information Format Format
webLICC
AppleLuppy
j-eggings Layer 6
ProRes ProxyGold (Grain Profile)
PrBufEncapDCT
h.26vorbis
h.26NeRFscene
Radiance XML
EXIFnoimage
rayJSON
WebX 2000
base64staticBlogSVG.meta
bitplaneConwayAnim

@jk Firefox and GIMP support AVIF and webP so I'm able to view and edit them fine, but no website's image uploader supports them so it's effectively a read-only format used by big tech companies, good job everyone.
@jplebreton @jk opening them in GIMP and editing them seems like the opposite of a read-only format! Also, bandwidth efficiency is a plus for everyone, especially those on poor connections. Also, generally those images are hosted with fallbacks, so that your browser can download the version it supports/prefers.
@miloignis @jk Read what I wrote again. I am saying it is a problem that I have a single offline application that can write/modify these files but no web apps will let me upload them (without saving to an older format, defeating the point). The onus to support those new formats is on those apps but the impact on user experience is the same.