[m12k]

They're saying making products that integrate with these platforms gets you "free" marketing exposure on their marketplaces.

[melomal]

This is how AirBnb grew. They took listings from Craig's list and added them to the site and then added their listings onto Craig's list (aka growth hacking).

[jack_riminton]

Ah ok, not a bad idea if you're going for the freemium model