POB is simiar to what Bitspark does with their ZEPH token. Zeph is Bitspark's native rewards token. Bitspark commits 25% of fees earned on transactions to buybacks. Referrals and Cash Points are paid in Zeph bought back from the market as well. Neat concept and a great incentive for on-boarding.
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Bitspark is just copying Binance's structure for BNB.
PoB is applied by a non-exchange business, STP.