Sorta. The function height(angle) needs to be continuous. From there it’s pretty clear why it works if you know the mean value theorem.

I wanna add to what other users already answered that this problem is not created by federation, only exacerbated.

If I’m mod of a community and I ban your [email protected] account, I cannot stop you from creating, e.g. [email protected] and coming back. Most servers have some barriers against spam account creation in place, but I’d wager you could easily create a handful of accounts on a server until they start to grip.

Even completely centralized platforms such as Twitter and Reddit are the same. You can easily ban/block evade a couple times per timeframe.

I hope you’re right because this article says they used a spray can.

Which brings me back to the last point in my comment.

I also hope I’m right. The two times I looked into it (right after the attack and before writing my comment) both came up with that result. Also it seems that English Heritage came out today saying there was “No visible damage”.

As I said, I’m not writing to defend the action, just pointing out that the OP article is, willfully or not, omitting certain aspects that could make JSO look a little bit better.

Edit: Formatting

but we did damage a 5000-year-old monument

As far as I could find out, they used orange cornflour that will just wash off the next time it rains. The most amount of damage anyone could seriously bring up was that it could harm/displace the lichen on the henge.

That’s not to say that I specifically condone the action, but it’s a lot less bad than this article makes it sound. It’s the same with the soup attack on one of van Gogh’s painting, which had protective glass on it. So far all the JSO actions targeting cultural/historical things (at least the ones that made it to the big news) have been done in a way that makes them sound awful at first hearing, but intentionally did not actually damage the targeted cultural/historical thing.

I think the biases of the journalist/news outlet/etc. are somewhat exposed by which parts they focus on and which they downplay or omit entirely.