What other crypto projects belong in the same Ponzi category as Richard Heart's $HEX?

Asking because the pattern recognition matters. High APYs that only work if new money keeps flowing? Founder with questionable history? Community that attacks anyone asking basic questions?

Drop your picks. Not looking for hot takes—want projects where the tokenomics literally require infinite buyers or the whole thing collapses.

The $HEX playbook isn't unique. Just want to map the others.