Microsoft and Skype

Microsoft paid a few billion dollars to buy Skype. But Skype is now outdated. Few people use it now. I had some credit in my Skype account, but it was not used for a few years.

I believe most users have abandoned Skype. They probably use the WhatsApp chat or other new platforms.

Perhaps Microsoft had access to the Skype customer database. But how could Microsoft monetarise the customer data?

Could this be a bad investment for Microsoft?