What I don't get: Why doesn't Rocket buy the early competitors in the EU region - like iZettle (a Square competitor)? They have a product ready and entered a fe

What I don't get: Why doesn't Rocket buy the early competitors in the EU region - like iZettle (a Square competitor)? They have a product ready and entered a few markets already, it shouldn't be that pricey to buy them. The only possible reason I see is that the Samwer brothers are known for their "full-control"-approach to everything. But even then they could influence the product immensely - couldn't they?