The funny thing to me, which I haven't seen anyone else mention yet, is that way, way back in the old days, Grafana started out as a fork of Kibana. Go take a look at the first commit in the Grafana source:
https://github.com/grafana/grafana/commit/75d03fc49ab4f95ee4...
Before there was any code, there was a permissive license. If the choice had been made 8 years ago to make Kibana less-permissively licensed, it's very likely Grafana wouldn't exist right now.
Anyone want to guess what the third commit was? That's right, it was an Apache 2 license: https://github.com/grafana/grafana/commits/master?after=2bb7...
Before there was any code, there was a permissive license. If the choice had been made 8 years ago to make Kibana less-permissively licensed, it's very likely Grafana wouldn't exist right now.
And for historical fun, here's the first commit from Torkel after the fork from Kibana v3: https://github.com/grafana/grafana/commit/50e42c8bdd2099552d...