exists for no clear reason

Sounds like Humans

It also only has one hole, which, if you ask some topologists, is what humans have.
I thought most humans are 7 holes
Well, there’s the one obvious one - mouth through to the anus, there may be more openings to that hole, but I don’t believe any of them go all the way through.
That changes the topology though. It does go all the way through a section which prevents it from reshaping into a straw/donut
Yes. I’m afraid I’m not a real topologist, so we’re at their mercy. Let us pray they don’t come up with new holes.

I’m afraid I’m not a real topologist

But you are topologically equivalent to one!

Donut be afraid my fellow fleshtube.