Software like this _already_ exists. Credit bureaus, advertising firms, data brokers, skip trace databases, three-letter agencies across the globe, and nearly all of the Big Tech companies do their business building centralized profiles of basically everyone and that certainly includes correlating online identities.
The only difference here is that one is more limited and open source.
The only difference here is that one is more limited and open source.
"Privacy is dead, get over it."