Sort:  

I do not think it is mandatory..I believe it is up to the token creators @ervinneb.

It makes sense to airdrop to the holders of steem so that you can lure some to your site (if you were a token creator that is).

Even if one opts not to go that way, STEEM still needs to be purchased for bandwidth.

Coin Marketplace

STEEM 0.12
TRX 0.34
JST 0.033
BTC 122066.63
ETH 4452.00
USDT 1.00
SBD 0.77