As someone who is thinking to release some dev tool I came up with a fresh (silly?) idea I want your opinion on: make a dev tool free for individual devs, i.e. MIT or similar permissive license, but oblige non-tiny companies i.e. 10+ total employees, to donate annually an arbitrary sum of money. Even 1 cent or dollar will do, the idea is that if they go through a hassle of asking their accounting to do a money transfer they will probably pay a little more especially if their devs praised the tool. One question I cannot answer is how to put it in words and especially in legal words. Other is will it really work or am I just day dreaming. If they stick to minimal pay of 1 cent/year it still is sort of great because I have an official customer and can list it on the "used by" page for extra advertising bit.