That might work for now when those of us who know what to look for can readily identify AI content for the time being, but there will be a time when nobody can tell anymore. How will we enforce the tagging then? Bad actors will always lie anyway. Some will accidentally post it without knowing its AI.

I think they should add a tag for it anyway so those who are knowingly posting AI stuff can tag it but I fear that in the next few years the AI images and videos will be inescapable and impossible to identify reliably even for people who are usually good at picking out altered or fake images and videos.