Yeah, unfortunately file hosts out in the open tend to rapidly be DMCA'd (as you're aware with how often links are dead here at AnimeTosho within a few weeks typically). Putting them behind a simple "free" registration and an introductory post requirement in hopes of keeping crawling bots from prying can only go so far when users are bent on either being destructive or simply ignorant of the consequences.

Uploaders tend to put notices in their upload threads to let people know not to repost the links elsewhere, but to copy them to their own accounts and share their own link so the original links can remain fine. Obviously this model only works when people are willing to not play dirty and unfortunately being able to be "anonymous" ensures the people leaking such links can continue to do so without consequence.

The only other options involve locking out everyone and only sharing with select few trustworthy users through PMs or setting up some kind of usergroup promotions based on trust. Neither are ideal. We did run some tests with a "VIP Section" allowing uploaders to share some files to fewer users and others to the entire community, and it worked for a time. The problem mostly lies with "reddit users" who kept sharing links on megalinks. Fortunately when the people in charge of that were notified of what was happening, they helped stopped it and the three users responsible were banned from the community.

Almost all of the American animation Amazon and iTunes rips come from users of Kametsu, so it makes sense that there are those wishing to share that content elsewhere. We don't care if they do. Sharing is a good thing. It's just polite to copy the files to your own filehost account and share that instead. =)

Haven't had too much problem lately. The few slips here and there are usually from people who just want to be helpful but were clueless how copy/pasting the existing link to the public can be harmful.

In any case, we tend to share torrents publicly and keep the file hosts links out of "bots" reach. They definitely remain up longer this way (we've got some links that have remained available for 6 years now).