As long as you’re careful when you’re stripping the outside protective sheath and don’t cut thru the black or white insulation on the internal wires and don’t have any stray / frayed conductors sticking out after you screw everything to the terminals it’s going to be plenty safe. I usually try to make the first cut above the ground wire because it doesn’t matter if I slice into that one on accident. Making AC cords is a lot easier than terminating coax or cat-6, you just have to bear in mind that the consequences for screwing it up can be a lot higher.
I was wondering about this also when I tried to sign up to lemmy.world on Monday and it seemed like it just timed out while I was trying to register and login. It looked like they were getting some traffic but it shouldn’t have been enough to bring everything to a crawl like that.