WeChat is so much better than other messaging platforms that I'm willing to get on it in spite of privacy concerns. I have never noticed an ad and I'm in complete control over what messages I receive. It just feels so much better than Facebook or Twitter where it's obvious that my data is the product. I have no idea what kind of things WeChat does with its massive amounts of data, but at least they have legitimate revenue streams that don't involve shoving unwanted content in front of me.