Another cool thing about nostr, also, is that it can be very dynamic. Since people usually are using a bunch (or even many) different relays, some of them might be running intermittently without any real impact. You can even run your own relay on your laptop, tablet, or phone, only when you or your family/friends are connecting to it to use it, and have it off the rest of the time.

Regarding your PS: I'm not the author of the article, nor the OP of this post. I just chimed in to point out a couple of mistakes in the article, to help the OP improve it. I didn't find anything else wrong, either.