Oath (Yahoo) doesn't even use Yahoo Mail. We're all on GApps.
Oath's goal is to be the premier "AdTech" company. According to leadership we're only behind Google and FB. But the division I work in doesn't touch ads so I'm not the best person to talk to.
I assume that if Verizon is being hands off Yahoo must be doing decently well. Otherwise I'd imagine they would be trying to move it in a new direction.