Ask why. go talk to the technician. Look at the fluids with him. See what's up. Maybe there is a reason. Some fluids you change for maintenance due to time and mileage. That said, the fluids may look just fine, it's prevetitive or just time to change them. If any are dark or discolored they should be changed regardless of time or mileage.
A lot of oil changers do make money on upsells. Filters, batteries, tires, wiper blades. It gets them to look over your vehicle closer instead of just changing the oil n filter and putting a sticker in the window.
Ask why, go talk to the tech, look for yourself.