I assume you meant market availability otherwise G7 and G7 plus will have versions with dual SIM-rgdot
Motorola usually only offer the Dual SIM Moto G versions in EU, Asia Pacific, and India - for some reason the US seems to only get the single SIM version. Like the rest of the world gets NFC but the USA get the Magnetometer instead - very strange decisions, (although it looks like the other regions might get the Magnetometer also with the G7).
Just wish they had kept the fingerprint reader on the front for the G7 where it's more convenient - something they probably could have done easily since they still have One Button Nav on the front, (like the G5(S) and G6), along with the space wasted with the Motorola printing.