It’s exactly a ponzi scheme.
Current income is used to pay past investors. The investor pool has to continually expand, or the scheme collapses. That is exactly how SS works.
And here’s no such thing as a SS “trust fund”, It’s a pile of IOU’s the government owes itself.
I just read Ponzi’s life story and it’s no where near that. Ponzi was accepting money voluntarily, SS takes it from you as a tax.