Used to be, don't publish information about yourself that could be used to impersonate you. Then we got Facebook.
Installing random binaries used to be a bad thing, now it's outright encouraged. "Thanks for using our toilet. Download our app to unlock the door!"
Telemetry/analytics/arbitrary callbacks used to be shady/questionable and require user consent, now it's standard practice to exfiltrate whatever you want from user devices. You've got root/elevated privilege, encryption is easy and your traffic can easily blend into the haystack, so why not.
Opt-in billing used to be the domain of sleazy porn sites, but now you can't buy anything from Amazon without them trying to surreptitiously slip a Prime subscription into your cart during checkout.
Seeing traffic from anonymous VPNs logging into financial accounts used to be an obvious giveaway of something suspicious going on. Devices are now shipping with easy-to-enable "anonymous mode" apps that average users have no legitimate need for and route all of your device's traffic through god knows where, which has the effect of making your traffic indistinguishable from a fraudster's.
Popular email clients, budget analysis and social media platforms will solicit and cache third-party credentials for your employer, your bank, or your life if you provide them. This despite a decade of trying to beat "never give your password to anyone!" into the popular mindset.
Same with algorithmically-generated domains/subdomains, etc.