They also had a browser called Orion and till date that gave me anxiety because YouTube videos won't play the first time you load them, you need to refresh the page (randomly) and similar other weird quirks. It's state hasn't changed much over the last year either, so I switched back to Brave now.
I don’t think that’s Orion specific, I have the exact same issue with Safari and Firefox
I'll pitch in that since youtube was bought by Google it's become pretty anticompetitive too. They've absolutely been caught degrading their product on all browsers except chrome. I've witnessed this numerous times on Firefox on my android. Videos refusing to play, subtitles appearing off the screen, refusing to fullscreen, and at least 3 more annoying things i can't remember anymore.
This is incompetence, not malice. YT devs would skip testing on Chrome if they could get away with it, but are forced to.
On numerous occasions, I had issues with YouTube and Firefox that were fixed by changing the user agent to make it look like chrome.
I stopped using YouTube 10+ years ago, so no clue if it still the case.