WhatsApp has this reciprocal approach which seems fair. If you don’t want your read status to be reported, you can also not see those of others.
I am personally opting out, and I would prefer privacy over tracking, but apparently it is a big reason for keeping Newton afloat.
It might be naive, but I never saw the point. That I open an email doesn’t mean I have read it. For marketing purposes it is more about the numbers I guess.
Transparency goes a long way, so Newton might at some point dedicate a blog post to tracking and explain why it is powerful and how it is done ethically.