Opera used to be a fantastic web browser, with a custom high-performance Presto rendering engine and features like tabbed windows that didn't show up in competing browsers until years later. However, the modern Opera browser is a shadow of its former self, reliant on chasing trends and meme advertising to
I loved Opera’s own engine. It was snappy and memory efficient. But their developers, at least back then, were very toxic. I remember them releasing a version which broke GMail and other Google products and they all collectively went on vacation saying it’s a non-issue, instead of delaying the release. Any mention of this on forums guaranteed you a permanent ban.
They only have themselves to blame for user migration and all this controversy.
Opera was always hampered by not being IE or Chrome
https://en.wikipedia.org/wiki/Usage_share_of_web_browsers
the migration to Blink was in 2013, it helped at first it seems
Here’s the summary for the wikipedia article you mentioned in your comment:
The usage share of web browsers is the portion, often expressed as a percentage, of visitors to a group of web sites that use a particular web browser.
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I remember that it was Google which intentionally made their sites non-functional with Opera. And that changing user agent alone was sufficient to make them work. I may be mistaken, of course.
EDIT: But yes, their developers were like that.