Email is unencrypted by default anyway. Just encrypting your mailbox is not enough, because ultimately you are sending your email to someone else, and their mail server will have access to the email. For conversations where privacy is important, I would setup PGP or use another method of communication like Signal.
Why do you need ads for this? I don't remember the last time I bought something because of an ad. You don't need to pay for professional opinions on everything. I wanted to buy a pair of headphones recently, and so I just scouted the various headphone discussion forums on the internet (head-fi, r/headphones etc) and there was a lot of high quality information and opinions and I was able to make an informed purchase while paying nothing extra. It is very rare that I'm looking for a product and I can't find recommendations this way, and even if that happens I can ask my friends. The best part is that they probably don't gain anything from you buying some product, and that increases my level of confidence on the veracity of their reviews and recommendations.
At this point I've pretty much trained myself to zone out when I see an ad because it is probably peddling some mediocre crap.
I've seen a few WebRTC server implementations pop up recently but the only clients I have seen are web browsers. Does anyone know of any WebRTC client implementations apart from the browser? Or am I misunderstanding the WebRTC architecture completely?