Yeah. It would have been so easy for them to do the right thing instead. Name is required? Check at login, prompt, block whatever "full access" means until the user handles it. Fixes all your missing names, not just the ones attached to people who came to your attention, and doesn't take control away from the user. Or to handle cases individually, notify when discovered and then block access until the user edits. Easy peasy. No consent violations required; the user can edit, delete the account, or walk away.