Doesn't using pi be against their terms of use about having to go through Claude Code cli for all Max plan usage? (I had use Droid with Max previously, it was a great combo).

It's unclear right now. The current stance is that using pi or other coding harnesses eats into extra usage and that is the behavior one sees today. We have added a hint to pi now that warns you when you use an anthropic sub.

Probably - it was that kind of confusion that resulted in me switching providers.

Plus I like being able to switch a model.