Well, assuming fire temperature to be 800C and temperature drop off close to 1/r² - you need to be approximately 28 meters away from a point source to feel 1 degree Celsius increase in temperature. Forest fire is not a point source, it’s a wall of fire, but give it or take - 100 m away it you shouldn’t feel any heat coming from the first fire.
You have allowed tick-tock website to send you notifications I guess. If so, you can clear this permission in your browser settings.
It was a way to support nice and friendly website back then, sort of like donations
I would think that updating 50.000 Lemmy instances would have a similar performance effect of 50.000 Lemmy users browsing one instance. In that case instance with one user won’t benefit the Fedeverse, but shouldn’t be an issue either.
It is anything you want it to be