I would blame this one on DDG, actually. PSA is an incredibly common acronym for public service announcement. Wherever DDG sources acronyms for might also be as

I would blame this one on DDG, actually. PSA is an incredibly common acronym for public service announcement. Wherever DDG sources acronyms for might also be assuming people just know it. Try wiktionary or Wikipedia disambiguation pages for acronyms when they don't show up in search, I can often find them there.