I think the "backend guys" will end up getting lots of free marketing and zaps from "frontend guys", which makes economic sense.
The person who only interacts with a social media client doesn't need to know who runs the git client it's hosted on. The person using the git client is the customer of that person. It's business-to-business (B2B).

This is why "zap who you know" actually works well and distributes the money in a logical fashion.