Most, if not all of these images are hosted through i.reddit.com or imgur, which will stop working if the original reddit or imgur, etc post is taken down as well.

That way, OP on Reddit still remains in control even if unaware of the bot.

It doesn't stop someone from saving the image or video and republish somewhere else without OP consent (either here or on Reddit, etc). But that's not what the bot is doing, it's simply linking to the original source.

You're probably thinking of the Lemmit bot and community. There's no reason to not name and shame here.

While I find it weird, unnecessary, and kind of gross too there's an(or there should be an) implicit understanding that everything anyone puts on the internet is there to stay, forever. Rarely ever is deleting a photo actually removing for good and your tidbit about consent isn't quite relevant.

The vast majority of the women that are being reposted are Onlyfans models and have watermarks on their photos for this exact reason. Reposting it like this only serves as extra advertising. For real exhibitionists and people who aren't making money off the transaction, yes it's gross, but I don't think you can create any universal rules to easily differentiate between the two without very heavy moderation.

I'm not a fan of stealing nudes from people that willingly share them online with a chosen community. But people will always find weird ways to justify theft.