"A company that's not good at marketing and sales doesn't stay a company - no matter how good the products are ;-)". does a product that grows due to word of m

"A company that's not good at marketing and sales doesn't stay a company - no matter how good the products are ;-)". does a product that grows due to word of mouth amount to good marketing? i believe not. dropbox, github and recently put.io. i learnt about these products because of word of mouth e.g show hn not Google ads or some youtube marketing gimmick. i tend to use a product if a friend i know is immune to FOMO recommends it to me.