alt Hacker NewsI don’t think anybody will blame GrapheneOS, it’s not even installed by default. Motorola will absolutely see that GrapheneOS support is not a value add and will decide against spending whatever nominal value it cost them to have first class support for it though.
The partnership between Motorola and GrapheneOS is a long term one. The effort that is put into providing the needed hardware security requirements also benefits Motorola directly, as they can use that hardware themselves. What you are predicting will happen is not corroborated by evidence.