Every conversation will invoke a feeling that someone is trying to sell something for profit.
This is one of the issues in modern commerce in China.
If I booked a vacation with some company and they offered me to join their WhatsApp group specific to my destination I see nothing wrong with that. The reason we don't have that here is probably that it's too expensive. In China you can hire someone for next to nothing to monitor some WeChat groups and have them answer frequent questions or extract potentially useful new information from other users conversation in that group. Shouldn't be too surprising and if you don't want this, don't join. Like when you're uncomfortable with sharing random recordings from your home with Amazon, don't buy Alexa.
All the live broadcaster use their friends network. Every conversation happening in WeChat or other messaging app is analyzed multiple times to figure out what could be sold to those people to generate profit.
It becomes tiring when you can only see in everything one do someone is trying to sale something, be it taking taxi, trying to talk with your friends, watching movie, even when people sleep companies try to analyze their sleep and process the information to find what can be sold to that person.
Err, WeChat doesn't have any advertising, notably unlike Google and Facebook.
What? WeChat does have advertising.
"So what does advertising on WeChat look like? For the most part, ads on WeChat are similar to those seen across most social platforms. Brands can create Official Accounts that users can choose to subscribe to."
"Brands can also raise awareness by running paid campaigns focused on driving new users to subscribe to their official account."
"Other paid popular paid tactics include display banner ads and WeChat Moments. Moments are essentially WeChat’s version of Facebook ads. These populate in a user’s social feed so that they appear native and unintrusive. Advertisers can choose to either place up to six static photos or up to 6-15 second videos."
https://www.pmg.com/blog/3-things-to-know-about-advertising-...
"Since Tencent announced WeChat advertising in 2015, we have now helped dozens of brands launch campaigns on the platform."
https://www.shenglidigital.com/blog/why-advertisers-should-c...
"A Comprehensive Guide to WeChat Advertising"
https://tenbagroup.com/chinese-marketing/a-comprehensive-gui...
"Advertising on WeChat: cost, format, targeting, rules & regulations"
https://wechatwiki.com/wechat-resources/wechat-advertising-m...
That's not advertising, because it's explicit search, subscribe, opt-in. It's more like an opt-in newsfeed that gets aggregated in to your other alerts.
Quite right there are ads in WeChat moments, I had completely forgotten, as they were quite rare when I did use the feature and these days, like many people I don't use that feature... resulting in an experience which is, truthfully and completely without ads.