[pests]

TLDR: They haven't explicitly added a license, on purpose.

https://choosealicense.com/no-permission/

Sad optimism of the commentor to get a PR going if that was all it needed.

[jsiepkes]

They could have just added a LICENSE file which stated you are not allowed to use to software without a commercial license. Instead they chose to be vague about it. Doesn't really inspire confidence.