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Russian cosmonauts toss old equipment overboard on ISS spacewalk
(www.space.com)
Cover author: Michał Kałużny http://astrofotografia.pl/
I assume this will just burn up on re-entry?
I know NASA ships their garbage back though, so I can only assume there's a good reason for that...
What goes around comes around.
As long as the chuck it the right direction with enough speed, it shouldn't be a risk to ISS.
I think there's less uncertainly in packing garbage into a deorbiting capsule, though.
Relevant Scott Manley video:
https://youtu.be/cxNJoaBLLNM