> Why link to that old issue instead of just the LICENSE file?
Because until linked issue thread was started there was NO branches with a source and `LICENSE` file — as on 2017 in add-on repo there was only one branch with a single file (`README.md`) without any metnions of GNU GPL licensing.
See this comment[0].
BTW, Only in early 2020 branches with a source and `LICENSE` file was added into repo.[1]
Because until linked issue thread was started there was NO branches with a source and `LICENSE` file — as on 2017 in add-on repo there was only one branch with a single file (`README.md`) without any metnions of GNU GPL licensing.
See this comment[0].
BTW, Only in early 2020 branches with a source and `LICENSE` file was added into repo.[1]
[0] https://github.com/vvoovv/blender-osm/issues/42#issuecomment...
[1] https://github.com/vvoovv/blender-osm/issues/42#issuecomment...