Interesting. I got the impression from the recent announcement that Grafana Labs had something of a revenue sharing model with the new AWS managed offering of Grafana. Given that, I wouldn't think the SSPL restrictions would be as important.
we do indeed have a partnership with aws around grafana. but the cloud landscape goes beyond aws, and the grafana labs landscape goes beyond grafana itself.
bsl is interesting, but license proliferation and familiarity is a big factor to consider.
now that both elastic and mongo are both using sspl, it is more appealing. i think tsl from timescale is also a great and well thought out license.