What do you invest your time and energy into, then? The "web format" isn't open in a meaningful way either when it's dictated by a monopoly, to fit their business needs in a closed ecosystem of servers at hardcoded IPs/certificates and a "browser" pretending to be open but overwhelmed with features to the point nobody can compete in the name of self-declared "web standards".
> What do you invest your time and energy into, then?
Libreoffice instead of MS Office, GNU/Linux instead of Windows or Mac, Firefox instead of other browsers, distributed social networks based on free software (Mastodon, PeerTube, Pixelfeld) instead of the monopolies, Librem 5 instead of IPhone, Pinetab instead of IPad, Pinetime instead of Apple Watch, Bandcamp instead of Spotify and many more:
I've gathered together what's left of it and invest in that. Through much trial and error, I've figured out the bits which work in both Chrome and the rest of the 25 years worth of historic browsers and write for that.
Sounds interesting. Care to publish your results (yes I know caniuse however I'm more after a core set of browser APIs/features defining a "real" long-term standard)? Btw I myself have also put quite some effort in distilling a HTML DTD grammar from WHATWG/W3C materials [1], defending it in conferences, etc.
Shame about all that Flash content...