You can't call something ethical without going into detail about what you mean. and:
Policy No Ads No Tracking We respect you
is not useful.
The value in ethics is in the conversation around what is ethical, not in a big, friendly "this is ethical" sticker.
This is as useful as "do no evil", and from the vague wording on the landing page, I'd imagine the people behind librem don't think google is very ethical right now.