Welcome Slick RCBD,
Thank you for reaching out to Microsoft Q&A forum.
According to Microsoft's documentation, Bing still supports exclusion operators:
- -term or NOT term should exclude results containing that term.
- NOT must be capitalized when used as a word operator.
- Parentheses can be used for grouping terms in more complex searches.
For example: "Silent Hunter III" -GWX "Silent Hunter III" NOT GWX are the documented ways to exclude "GWX" from the results.
However, there have been multiple recent reports from Bing users stating that exclusion operators are not always being honored correctly in practice, even when the query is written according to Microsoft's documented syntax.
Minus symbol no longer excludes that word in bing searches - Microsoft Q&A
Exclude terms from Bing search - Microsoft Q&A
Bing Search Operators Not Functioning Corrrectly - Microsoft Q&A
As a workaround, you may get better results by combining exact phrases and additional positive keywords, for example:
"Silent Hunter III" "vanilla"
"Silent Hunter III" "unmodded"
"Let's Play" "Silent Hunter III" "original"
Microsoft's official advanced search operator documentation can be found here: Advanced search options | Microsoft Support
If Bing continues returning GWX results despite using the documented exclusion operators, I would recommend submitting feedback through the Feedback option available on Bing so you feedback will be reaching to the right team, the team can investigate the search behavior.
Thank you for your understanding.