Someone who is has a strong preference for copyleft licences may not want to contribute to a project with a permissive license.
The intent may not be for the project owners to use the code in proprietary software, but it would be to allow someone to do so.
Someone who is has a strong preference for copyleft licences may not want to contribute to a project with a permissive license.
The intent may not be for the project owners to use the code in proprietary software, but it would be to allow someone to do so.