Everyone does it differently. It's a preference that varies greatly depending on how big an operation the owner is running. If they are doing all the cleaning themselves, with not a lot of time in between guests, they might ask that you do this. Doing so also helps the cleaners know which beds have been slept in, however, just leaving an unmade bed does the same thing.
Many managers will have a stockpile of sheets, towels, and pillowcases so that they can change the sheets with fresh ones, and take the used ones offsite to be washed in hot water. Laundry on site takes forever, and it's not an efficient use of time!
We do ask that trash and recyclables be taken out, just in case the cleaners can't get there the same day.
I have had guests who went the extra route and vacuumed and swiffered as well. They weren't asked, but this was their personal preference as they were traveling with pets. (One, bless her, even travelled with a tape roll to get any pet fur off the sofas and beds. While we ask that pets stay off the furniture, we have pets ourselves, and know that fur travels!).
Remember, we aren't a hotel. Many AirBnB's are a personal extension of the owner's home, so any TLC given to it by the guest is very much appreciated.