"Use a unique user agent string ..."

Is that really the best option: blocking based on UA header

What do users think about websites that try to tell them what browser to run. There are sites like this one giving "advice" on which browser to use (https://theprivacyguide1.github.io/browsers.html), sites that display messages that tell the user to switch browsers and sites that try to block the user's choice of browser by reading User-Agent headers. Headers are trivial to add/delete/modify

All in the name of online advertising. It is a shame this is what the www (and now the "browser") has become. A medium for delivering ads.