Rewards token are those which you only need to hold on your wallet and receive dividends just by holding.
there's tax when you buy the token and part of that tax get distributed to the holders.
examples are:
$EGC which you receive BUSD as dividends
$SFM which you receive SFM as dividends
$ALTS which you receive any BSC token of your choose as dividends
It also depends on what product the token generates, the development of a useful product is important for the sustainability of the project, if only relying on the trading volume generated from the hyip, the project will most likely die slowly.