So far four threads about the same issue on the forum Mac first page.
- https://forums.opera.com/topic/54249/launching-opera-pops-up-crash-message?_=1647874829858 (this one)
- https://forums.opera.com/topic/54652/opera-for-mac-is-crashing-topic
- https://forums.opera.com/topic/54412/false-opera-crash-report
- https://forums.opera.com/topic/54635/unexpectedly-quit-alert/3
I was told that updates had been disabled for older macOS until this is fixed, but that seems to not be the case as OK v83 always updates to problematic v84 for me on every launch.