A structured database, with separate code to query the data and perform calculations if needed.

There are very few cases where a spreadsheet is the best tool for the job, in most cases it's the only tool the user was given so they came up with some frankenstein mess.

You can't that's the point.
If someone can view the data, they can copy it. The only way to "secure" it is to prevent them from viewing it in the first place.

Any attempt to allow viewing while restricting copying or modification is theatre at best and only provides a false sense of security. At worst it's actively harmful because users who naively rely on such systems often end up taking less precautions than they otherwise would have.
There are _ALWAYS_ ways to bypass such systems.

Sometimes I wake up and start doing new science. But usually I just roll over and go back to sleep.

Anything can fail, which is why the whole point of a backup is to have more than one copy in different places.

He's creating a "middle class" - they will get the info after the regular insiders, but before hoi polloi.

He should have thought of selling multiple levels of higher tiers.

For a small fee you can get your bullshit before everyone else.

There is absolutely no reason that work and other mandatory things cannot be done at night, leaving the daytime free for you to do your own things. Wasting what limited daylight hours we have stuck in a cube farm with artificial lights anyway is ridiculous. There are very few jobs that actually require natural light these days.

Further from the equator there is not enough sunlight for that. You'll either be going to work/school in darkness, or coming back in darkness unless you want to severely shorten the duration of the work/school day.

The sun always rises later in the winter, that's the nature of winter... The only thing this changes is the arbitrary numbers that are displayed when the sun is rising.
Instead of fixating around those arbitrary numbers, plan your day around actual environment factors like when the sun rises etc.

The root of the problem is rigidly tying people's daily routines to an arbitrary set of numbers, and then changing those numbers rather than changing the routine.

I should have added:

"In general, renaming things does not fix a problem."

Though heaven knows, lots of stupid people try it.

Why not just discard the whole idea of DST instead of putting it into permanent effect?

The whole concept is an attempt to redefine time as a way of addressing perceived social problems. Schedule activities around the clock, not the clock around activities.

Not surprised that someone exploited a vulnerability, but surprised that deployed military personnel are allowed to use civilian communication systems.

Assuming that CGNAT makes you immune is a huge error.
Once you compromise a single customer you're now inside the CGNAT pool, where you will see lots of very vulnerable devices because they were left vulnerable on the assumption that they were not reachable. In an ISP with thousands of customers, at least a handful will have some infected devices.

Modern Windows devices absolutely do not become compromised via inbound connections to open ports, they become compromised via vulnerable client software or user error (eg phishing, malware infected downloads etc), all of which only depends on being able to make outbound connections.

You shouldn't be relying on perimeter security anyway, every device should be able to stand on its own in a zero trust scenario.