webapp-rec was created 11 years ago before web app recommendations were removed from the site scope, 7 years ago.
Make all recommendation questions out of scope and off topic, regardless of research
filter has "DO NOT USE THIS TAG" because in this site it's considered a meta-tag. From Let's clean up some meta tags:
filter - Can't possibly work as the only tag on a question. I see it used for gmail (it should be gmail-filters), google-spreadsheets, yahooemail (which should be yahoo-mail), youtube comments. This also seems to run afoul of ...