Ever thought that the AGPL was too weak and didn't encourage sharing source code? The SSPL is a viral copyleft license that requires you to share all the other software supporting your service!
https://lwn.net/Articles/768670/
(I'm struggling to imagine anyone who would use this.)
miniblog.
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Excellent article on level design in games to encourage player exploration, and considering the movement motivations:
Cryptocurrencies are one of the few places where white papers are celebrated. Sometimes it's just a tickbox exercise, but it does encourage thorough, up-front discussions of design.
Overall I've been impressed by @digitalocean's #Hacktoberfest to encourage people to contribute to open source.
It doesn't have any perverse incentives (you can 'cheat' with PRs on your own projects) but it celebrates developers who collaborate.