LGPL is a viral license and cannot be used in a Unity Project that is closed source

[fragmental]

Any Unity project that uses LGPL code must be entirely licensed as LGPL also, unless that LGPL code is compiled as a dynamic linking library like a ".dll" or ".so". An exert from TldrLegal "If you distribute this library in an executable, you must make the source available for 3 years.""

Here's some discussion on its use in a different project jondewoo/UnitySlippyMap#20 (comment)

For Unity Projects, it severely limits how people can use the code, and sets people up for accidental legal complications if they don't realize or understand the restrictions.