The comment you replied to is (snarkily) saying that as long as a company is "hot" (i.e., it has a lot of users) then investors will keep coming. That's totally

The comment you replied to is (snarkily) saying that as long as a company is "hot" (i.e., it has a lot of users) then investors will keep coming. That's totally reasonable; a product doing well that grows as a function of the number of users using it is a promising investment (especially when those users are paying!). That's not a Ponzi scheme.