“[F]or unsuspecting merchants who may be unfamiliar with the DMCA, a sudden onslaught of takedown notices can result in the termination of their entire store under Shopify’s repeat infringer policy,” Shopify explains.

First of all, the person doing this is an asshole. Filing false DMCA claims is a dick move and can fuck with people's livelihoods.

Second, if this is something that causes harm due to your policy, perhaps it's time to review that policy and the ways you enforce it.

And third, the DMCA itself needs a serious review of how it needs to be handled and how to reduce harm on the innocent people affected by false claims.