I think imgur was using apng for a while before moving to webm/mp4
If the page you're on can survive a reload, you can often find the interesting mp4/m3u8 request in the devtools network tab. You probably knew this already.
I would have expected them to have fixed the obvious issue with their UI by now.
Are we talking about the same Reddit that still runs three different versions of their website because the newest version is so bad that people refuse to use it? I'm not holding my breath.
They seem to be following the 'ooh shiny' philosophy of software development.
This is the web nerd equivalent of sitting next to a petrol-head at the traffic lights revving your engine.
(Reminds me of sites that disable pasting in passwords from your password manager, so you have to have xdotool type them for you. Again, not sure what they think they're saving me from. And I'm not sure why browsers have APIs that allow this sort of thing.)
Knowing how to use the dev tools makes you like a 1% in the world. And blocking out 99% with a simple div or something is a pretty good ROI