Presumably that's where having a single place to handle payments comes in handy. It's (hopefully?) less "well, you have to go to this other person and license

Presumably that's where having a single place to handle payments comes in handy. It's (hopefully?) less "well, you have to go to this other person and license their software too" as much as "here's the total cost for a license (which happens to include both A and B)"