It's good to know. Unfortunately, in Uruguay we're not part of the 28 countries where Brother has recycling in place [1]. And I don't think we get any real alternative except for rogue refilling of the cartridges, or just recycle it as regular plastic waste.
Still, I consider having recycling in 28 countries to be pretty good.
https://www.brother-usa.com/supplies/toner-ink-recycling Go here, print a label, put old cartridge in the box your new one was in and drop it off at the post office or have your postal driver pick it up.