It's not setting an example if you shift responsibility to someone else.

Setting an example would be just doing without the things he doesn't agree with. Need to make a call but only other people's cell phones are available? Well, you don't make the call. Need wifi but no open networks are available? Well, you don't get wifi. Is this even more inconvenient than the already-inconvenient use of other people's cell phones or wifi logins? Absolutely. But it's actually sticking to your principles.