The curious thing is that there is a financial rationale for maintaining the minimal data, and allowing account recovery. If I bought a game or two via Ubisofts store a few years back, and I remember that game and go through the steps to recover my account… I might see more games that I’d actually rather like to buy.
The cost of keeping a minimal set of account information is a minuscule cost, with a potential upside.
I think they do this to discourage people from letting their accounts go dormant and risk loosing their games. Which makes some sense, lock you customers in, use their sunk cost to encourage activity.