ROM Security

[ucladuke]

Hello, I am very new to the modified ROM scene so please excuse this newbie question. I am very interested in upgrading my Sprint HTC TP2 6.1 ROM to one of the modified 6.5 ROMs available on this site. But before doing so, I'd like to know how "safe" are these ROMs?

Specifically, how do we know that these ROMs don't have a trojan/virus that will grab my emails, passwords or personal information and send it to some external site? If the answer is that we simply don't know and that we must trust the "chefs" then I am okay with that answer as well. Just asking, that's all.

Thanks!