I just decided to try the crowdcrafting.org link in the question above, and the first task I received contained a link to https://meta.security.stackexchange.com/questions/227.
Obviously, that's not going to work (unless I edit the URL or manually add a security exception for the invalid certificate), since it's still using the old per-site meta.security hostname. I guess that something that should be fixed?
Also, it turns out I can't handle that task anyway, since I'm 22 rep points short of having edit privileges on security.SE meta. But that's not really something the crowdcrafting site could possibly know.