Chain crunching after degrease and lubrication
If the sound started suddenly after you cleaned the drivetrain very likely something got misadjusted or knocked out of alignment. Any issues with chain wear would show up gradually, also 200k is nowhere near enough mileage to put significant wear on the drivetrain. 

Issues with changing chainrings indicates the front derailleur got knocked out of alignment. That's easy to do accidentally. It's likely you are getting some bad chain-rub on the front derailleur cage If you can hold the bike of the ground, on a work-stand for instance, manually turn the cranks and work the shifters you should be able to figure out if the sound is coming from the front or rear derailleur area.

If you have a through axle rear hub you can't misalign the wheel in the frame. If you have a quick release hub it's definitely possible to not get it in the dropouts properly, so check that. Stand the bike up vertically, loosen the quick release, make sure the axle is seated in both dropouts and tighten the release again.  

I'd run through a complete front derailleur adjustment process to get rid of the chain-rub and make sure the adjustment is correct. Park Tool has a great page with videos that includes triple chainring derailleur adjustment. Thay have a rear derailleur page as well if you feel the rear derailleur needs a tune up also.