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
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
Opera added a user agent header “selector” pretty early so it would tell the webpage it was chrome/IE/Firefox. It was important for compatibility for a lot of websites. I’d trust that listing less for them much less than I would for the bigger/default browsers.
The migration from their own codebase to chromium in 2012/2013 was…rough. They were the first browser to have cross-device synch and you couldn’t import bookmarks for a long time, much less RSS feeds/everything else people used Opera for. Their original userbase took a sizeable hit.
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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