Its difficult to find sources that are accurate on this one.
The reason is pretty simple to me: ethereum is like the Microsoft of crypto...while graphene is like the unix/linux.
Makes it really tough because one has the funding and larggelu ignores us because it would be harmful for them to ever compare themselves (it would only advertise us). And we have very little funding to document such things. But if u join the bts community you can ask away :)
Thanks! :)