black holes are capturing imagination because of scale and many other reasons, but their danger just not worth to even discuss. Space is empty and time is slow.

re/ black holes, probably, maybe

> Space is empty and time is slow

Not always slow, and the paths of objects in space are largely determined. Thus we do have interesting and potentially useful efforts like this:

https://www.nasa.gov/planetarydefense/overview

famous last words

The closest known black hole to Earth is 1000 lightyears away, so it's probably not much of a risk.

We just need these things to start growing exponentially.

As far as we know so far, there's still no way around the universal speed limit.

Wormholes and such

And the sleeping idiot-god at the center of everything could wake up, thus ending the universe. Same difference.

One is possible based in science, the other...possibly based in science. I was just saying that it is possible, not that it is probable.

You're unlikely to get exponential uncontrolled growth of that sort using wormholes, anyway. It's generally considered that any wormholes arranged in such a way as to enable causality-violating space-time paths (which is likely if there's a lot of them and they're being flung around with black holes) would immediately collapse. Not that there's any clear mechanism for how a wormhole could form, anyway.