Android has a reputation for being unsafe precisely because of sideloading (as well as low Google Play fees, looser app review, accessibility services and remote access).
This policy is bad for us HNers, but objectively good for the 95+% of people who will never sideload a legitimate Android app, but are extremely likely to get caught by scammers.
The heavy US skew of HN really distorts the arguments here, as Android-based scams aren't as common in AMerica due to the prevalence of iOS in that region.