Comment by trhway

from experience with similar product (where we had similarly sounding way of entity resolution based on rule based fuzzy indexes and fuzzy matching, and it was working for tens of millions of entities on regular, though beefy, RDBMS more than a decade ago) - the issue isn't that much technological, it is that each customer/client has custom everything when it comes to ER, and thus scaling that business is extremely hard (that specific business collapsed primarily for that reason)