Investors have a choice, and those who did not have time to buy at the ICO stage, then they can do it on the exchange.
Yes, we can always buy on an exchange. This can be attractive because, as mentioned above, prices often fall after listing.
Well, not immediately after the listing, the price of a new token falls, but in 1-2 months, when at least 1 time the price still grows well. That is, investors with traders organize pamp coins.