Don't pour hot grease in a glass jar or it'll shatter and spill hot grease all over your counter and then when you grab a flimsy piece of plastic from the recycling and try to push it on to stop the spill and the plastic collapses and hot grease goes all over your forearm and gives you 2nd degree burns and your floor is covered in broken glass you will regret it.
Probably people who are looking to form a long term committed relationship where resources will be shared.