It is better to block token and unblock it after listing on the large stock exchange. If they give tokens before the listing then they will appear on decentralized exchanges and its price will be very low.
That happened the price was very low because of the bounty hunters selling their token after distributing. Hunters are not mostly holding their token they are probably selling quickly their token share as a reward. And make the dumped the price of the token in the market and possible to not recover and make the token turn to cheaper price. So, it good to distribute first and then after a week list on the exchange.