alt Hacker News> Google Ads and Apple's Developer Program. If you want to acquire users and distribute a mobile app, you're paying the toll to Mountain View and Cupertino.
If you said Play Store, then sure, though at least distribution on there is free. But you said Google Ads, which you really do not need to acquire users. Returns on Google Ads were already low, and have only continued getting worse and worse. I'm sure someone here claims to be a magician at it and believes they can get a fantastic RoI out of it, and I'm sure some can. But the huge majority doesn't. It's very much like day trading stocks.
There's a huge number of other, better avenues for paid marketing if you want to do it.
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Google Ads does "kind of" work in the niche I am in, usually with low competition key words.... but I did stop throwing money at it. I am never going to return the investment per conversion... but if you want a search engine to throw your money at.. it is still pretty much without alternative to me.
Different industries have different customers with different needs and funnels.
None of my businesses use a "sign in with..." option and I highly doubt it would increase conversions, however the article and many commenters here are adament (based on their experience) that it is integral.
I'm not sure it's day trading per se, I think it's just a lot more relevant to some industries/products than others.