It looks like a lot because they removed the seals of the bearings but it really isn’t too complicated. Normally you would just replace the bearings altogether with new ones and I’d be pretty upset if a bike shop serviced my bearings and didn’t replace them and instead charged extra for labour but that’s just me, a meticulous bike owner. Ball bearings get rough, pitted and begin to rust. The race becomes no longer smooth and the bearing begins to feel rough. I’ve cleaned and repacked my share of bearings to prolong their life but I can’t say I would ever take the time and effort to remove every single bearing only to remove them, repack them and press them back into the frame. Some frame bearings can be a real pain in the ass to remove and reinstall. If you’re going to do a complete frame bearing overhaul I really believe your frame deserves new bearings. When you take apart an old bearing, clean it out and pack it with new grease it never feels even close to the same as a brand new bearing would.

The dirtiest bearings would have likely been the wheel hub bearings (row of bearings on left of right side paper towel,) the bottom bracket bearings (pair of 2 center of right side paper towel) and the lower headset bearing (large bearing right of left side paper towel.) The group of 8 smaller bearings next to the hub bearings are the frame bearings and they are usually well protected and aren’t in a location so prone to the elements unlike the wheel bearings, bottom bracket bearings and lower headset bearing, which eats a ton of mud the front tire picks up.