In theory: it's not greenwashing, it's so that the humungous amounts of resources they put into developing F1 engines are not completely wasted ... so that some of the tech can "trickle down" to road car engines. Hence, the interest in hybrids. At least they get to learn how to charge a battery really, really fast.

In practice, of course, it's all going to go a bit south when road cars go to 90% EV. There is already a "formula E", of course.