They could change the code after 8 months to exfiltrate your address book, easily. Most businesses pivot for whatever reasons, a giant database of users contacts would be precisely what one would want in order to mitigate unforeseen problems with the business model.

As for your kitchen example, you don't need to say anything. Walk into any room with a weapon and people will know they might be in danger. If I'm in that kitchen, and you walk towards me, I'll move out of arm's reach.

Basically it's the same problem: Assurances are worthless. Rationalization provides seemingly excellent reasons for any course of action. So, the onus is on you to show that no harm will be done. It certainly is not the responsibility of some 3rd party to establish this, that is a coercive worldview.