Since the article is in Dutch, let me try to provide a little extra context:
- It's not actually the company that runs DigiD, that's Logius, who is part of the ministry of the interior.
- It's about the cloud-hosting company that DigiD runs on. The DigiD code was open sourced, though it looks like the GitHub repository is now archived (https://github.com/MinBZK/woo-besluit-broncode-digid-app)
- It really is used for everything related to authentication with government services. Doing your taxes, scheduling an appointment with the city government for , scheduling a doctors appointment, getting a prescription refilled, on and on.