iconomi
ICN
down since they switched from dividends to buybacks
https://coinmarketcap.com/currencies/iconomi/

betking
BKB
https://hitbtc.com/BKB-to-BTC

binance
BNB
https://coinmarketcap.com/currencies/binance-coin/

bitdice
CSNO
https://coinmarketcap.com/currencies/bitdice/

All just falling, falling, falling while not collecting any dividends. Seems the buy backs aren't stimulating the market. No ROI being made.

Do you know any buyback and burn coins that disprove my generalization?

On the other hand, TAAS is doing well, paying good dividends.