If you don't do your own oil changes you should at least educate yourself enough to check the oil level after someone else changes your oil.
There are multiple horror stories of oil change places overfilling, underfilling, forgetting the drain plug, or the fill plug, or the dipstick, or not changing it, etc.
They are not urban legends. One friend had her rebuilt big block engine destroyed when the oil change place didn't refill it, and my father drove off from a toyota dealer without the fill plug, which resulted in oil sprayed all under the hood on his new Sienna.
I have myself 'accidently' left an oil filter washer on the block and installed a new filter over it (suprisingly common mistake). But I caught that as soon as I started it up, so it didn't cause much of a problem.
Anytime anyone does work on your car, inspect it afterwards to make sure nothing obvious is screwed up.
I had to teach our teen daughter this, after she came home and asked me if I could tighten her lug nuts on one wheel because "something was off". What was off was one lug nut, missing, and four others falling off, because the "licensed state inspector" did not retighten the lug nuts after pulling the wheel to check the brakes.