Why so many HEYTEA and Poetica Coffee locations?

I've been trying to figure out why these 2 chains have been proliferating around NYC recently taking up available storefronts. They are both new-ish and suddenly have ~a dozen locations each. Does anyone know the story behind these places and how they are able to acquire so much real estate? They're both fine (more so HEYTEA than Poetica) but it's alarming how many genuinely good small businesses have been taken over by these places.