Green flags:
- copyleft license (GPL or better AGPL) + they accept contributions without contributor license agreement
- code written by many people who personally own the copyright
- active community
Yellow flags:
- permissive license
- business model which can't be really be sustainable with a shit-free product
Red flags:
- VC funding (implies enshittification in future because of profit maximization)
- proprietary license
- project does not take contribution from the outside or asks to transfer copyright or sign some document (CLA)