"Unknown" license tag text is really hard to read due to low contrast
If the software license is "Unknown", it's text color #f7f7f7
on top of the background color #DBDBDB
is really hard to read for most people. You'll need extraordinary good eyesight to read it.
It scores 1.29:1 on this online accessibility checker. https://webaim.org/resources/contrastchecker/?fcolor=F7F7F7&bcolor=DBDBDB