There is Headscale if you don’t want to use Tailscale servers.

chmod 755 for when setting permissions to directories. chmod +x for making something executable right when I am about to run it.

Probably because in many countries with actual privacy laws that stuff is illegal, but they did it anyway because they figured the risk to reward made sense.

Then they are not rare by definition. These are not the books they are buying.

Yes, but being the only one able to get their hands on that book and destroying it has that added benefit. My point is that there is no motivation to preserve those books, quite the opposite in fact.

Because if you get all the copies of a rare book, scan it and destroy it, then nobody else can use it for training but you. They don’t have to, they choose to.

Tailscale also has Funnel.

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NextDNS is a good option for your use case. It allows you to block entire categories of websites and even has an option to setup a schedule on when you are allowed to access them. It also has blocklists you can pick from and the ability to blacklist and whitelist individual domains. And the free plan is very generous. You can just try it and see how it works for you.

Because that is the excuse that governments use to push for more surveillance. “Who doesn’t want to protect the children? Are you some kind of evil person?”

The biggest issue is that the Raspberry Pi doesn’t support sleep. So your only option to preserve battery is a full shutdown.

The only way to make a digital device 100% secure is by using a hammer.