Right, but new product or not if you use this as a solution for permalinks you are running the risk that in certain types of networks—especially those that the

Right, but new product or not if you use this as a solution for permalinks you are running the risk that in certain types of networks—especially those that the target audience for academic writing often operates in—people will not be able to access your links. That might be worth the trade-off, and it might well be that the service is well-known enough that even networks that block the entire TLD make an exception for Perma.cc. But I wouldn't assume that to be the case without validating it first. I also think it's worth just calling out bad TLDs when we see them so that people don't think it's okay to copy. Even if Perma.cc is well known enough to avoid the problem, your new app won't be.