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This can be circumvented with jailbreaks right now, by the way, on any firmware version 7.55 or lower. Hopefully we can just see future exploits for newer versions as the PS4 moves towards end of life.

The issue is that when your CMOS battery dies, your kernel clock goes to 0, and when its set to 0, its "disabled" and stops ticking. You can jailbreak to set it to 1 and it will start ticking again, or, even better, connect to the PSN to set it to the correct time.

Of course when the PSN is gone you'll need to jailbreak once every time your clock battery dies. So maybe every 10-20 years maybe? Those things last a while.

This is the same clock that causes your free PlayStation Plus games to stop working if you cancel your subscription, by the way. If users were able to just pull out their CMOS battery to reset their clock and make it tick, they'd those get free games for life. This stops that.

Which is why just "set time using internet" doesn't work. You could easily set up a fake NTP server to give you free PS Plus games for life that way. You must use the real PSN clock after replacing CMOS battery, it's a form of DRM.

However, the fact that ALL games fail to launch is because they try to set up their trophy list when you boot them and that causes a crash and logout. Sony should probably fix that, just put a "Clock not set - no trophies will be available" message and let us play with out them.

I've been running into this issue for years because I use a few PS4 consoles that have dead batteries. I actually just remove the trophy files before playing the games. It's funny to see this small issue that annoyed me for silly reasons for ages getting mainstream attention now.