The license chosen [1] (Elastic License 2.0) is one that isn't considered open source by many, due to not being OSD [2] compatible. Were you aware of this before marketing as open source and, out of interest, does the license & usage of "open source" come into conversation when going through the YC process?
[1] https://github.com/grai-io/grai-core/blob/master/LICENSE [2] https://opensource.org/osd/