Vibrating spiders (https://en.wikipedia.org/wiki/Pholcidae) are happy to eat anything that gets caught in their webs. In Germany, these are THE kind of spider you will most likely to find in a typical apartment. And they do not discriminate between insects and other kinds of spiders that happen to walk in.
The fact that none of the spiders I am likely to meet where I live (Germany) is even remotely dangerous to anything that is not an insect probably helps.
But still - at some point, the number of insects these beasts kill before they get annoying outweighs the terror I feel when one of these crawls across my desk.