how the hell are people getting these 3D CGI avatar profile pics & stickers of themselves on tt?

these are not the AI filters they are profile pics made from a photo of you. they can move. tiktok lets you use them as stickers with different expressions. literally no one is telling me how they made them idk why they are gatekeeping but pls someone tell me this is driving me crazy!!!😭😭😭😭😭