Comment by hibikir

Doing just payments is a really low margin industry, and the larger the contract you are after, the lower the margins. Therefore, it makes a lot of sense to try to sign up startups, as their growth is your growth. And to win in the startup market, you don't win by lowest costs, but by how much generic work you can save them. Cut their headaches, and they'll be happy giving you a wider cut.

Thus, a million little acquisitions to make the possible Stripe bundle for small companies stronger, as they become the moat. The opposite of, say, the Adyen play, when you want to lower your own costs, and make money on tiny margins to do processing for really large companies.