Opera's fateful decision to
offer compatibility with Chrome extensions abandon its own browser enginge in favour of Chromeium, alienating many long-term users and supporters in that process, means it gets smeared by association.
Well, they broke Opera for me earlier than that, much loved features were gone in an earlier version already. So changing their engine to Chrome was more of a "meh" moment for me.
What browser engines still exist for the desktop? Well, top of my head, Chrome (blink?), whatver Firefox is based on, and Safari (only Mac - no, wait, that's Chrome as well, isn't it?). There's Palemoon and Waterfox and other forks using the old Firefox, and whatever Konqueror uses (yeah...). Oh, and Lynx. Hmmm. So basically we have two (major, mainstream) broser families left: Firefox and everything else. Pity.