TimescaleDB has an open core style license that seems to prevent the cloud services from repackaging their DB. It's not technically fully open source, but it's

TimescaleDB has an open core style license that seems to prevent the cloud services from repackaging their DB. It's not technically fully open source, but it's pretty close to it. Actually, I just took another look and they now market their "open core" as the apache edition (or perhaps have diverged from the "community edition" now)