I really don’t see what the big deal is, if you see the email from YWN and it’s a advertisement from a sponsor, just delete it, how long does that take? That is what I do when I get them, it takes a few seconds to do and then I go on with the rest of my day. And yes deleting it from your phone, also takes a few seconds and I don’t even have to open it and than you won’t waste any kilobytes, like someone said above with that concern about getting these emails.
So YWN keep sending them to me, as I see no problem in you trying to make your source of parnassah greater.