But this is not how actual FICO scores work, and more interestingly, also not how historically Google has assigned domain authority for PageRank.
In both cases a history of transactions is required. Even if you could just spin up a new ID for a FICO score, having zero or little credit history typically means you'll have a very hard time securing any meaningful loans. Likewise, in the days when PageRank mattered a new domain would typically take a year to build up the authority required to get good results ranking well. Of course there were work around, but there are plenty of examples where easy to create a new identity does not equate starting with a fresh reputation (in fact even HN has the same principle! New accounts cannot, for example, downvote)