I love how paranoid and over the top this protocol is. Really is great for educating you on all the possible attack vectors and how to protect against them. Up to the user how far down the paranoia rabbit hole they want to go but it's nice to see what I would consider the most extreme end of the spectrum.

Here's the protocol: https://glacierprotocol.org/assets/glacier.pdf

Непонимание - больше риск потерять. Для хранения достаточно приватного ключа. Вам просто необходимо досконально знать как это работает.

Is this useful for people who run websites or individuals who are just holding some BTC?

Even if you don't use Glacier, it's a really great resource for understanding how one should secure their Bitcoin.