DMCA doesn't necessarily require a full-on lawsuit, in fact, many parts are written in a way that tries to avoid one. However, if Lem did, there would be war. It would be a violation of fair use, and NOBODY fucks with fair use on the internet without backlash.>>4065097
If you don't want backlash or an /ic/ thread discussing your shit moves, then yeah, ignoring it IS the option.
If you're a crybaby who wants everyone to bend to your will, then I guess you could make a fool of yourself.
1. Ignore. Porn can't actually hurt you. Nobody wins but nobody loses.
2. DMCA, and have the entire internet come at you, and have all and any credibility ruined.
3. Send your fans out to harass and bully R34 artists into submission, until a 4channer notices and makes an /ic/ thread about it.