Even though we use Grafana only internally and there would be no problem with AGPLv3 in theory I see big meetings with legal coming up which might result in us not being able to use it anymore. I could image that its the same with other corporations. In the end that might hurt the popularity of Grafana quite a lot.
If a company develop an proprietary UI and use Loki as backend, this is not serving Loki directly to customer, so that does not require company to release their code.
It is similar to GPL. Dynamic linking to a GPL software does not require the developer releasing their code.
Only provider serving Loki instance directly to customer required to share the code.
Only Amazon is upset that they cannot just host a popular open source project directly on their cloud. Maybe they could pay a license fee for dual licensing arrangement, which is a better way to support open source startup.