Facebook is now Meta, Google is now Alphabet, Netflix is now just another independent movie/TV studio. FAANG has become a term entirely independent of what it originally stood for (also "MAAA" doesn't have the same ring to it).
FAANG simply reflects what those companies are actually called. Most people don't say "Meta", they say "Facebook". And Google is still Google, they never changed names (they invented a parent company but still kept the name).