Technically speaking, no one outside of college demonstration engines are burning hydrogen
Toyota has made various working prototype hydrogen combustion engines, so it’s not impossible these could end up in production in the nearish future (they’ve done a hydrogen version of at least the GR Yaris/Corolla engine, a V6, and a V8).
You don’t necessarily have to have ejector seats - WW2 era bombers for example relied on the crew making their way to a hatch to bail out. Despite being a considerably lower chance of survival than modern systems (not helped by various positions having to crawl through narrow spaces to escape and/or find and put on their parachutes due to not having space to wear them during normal operation) the option of bailing out saved a large amount of people.