People go to the Valve service.

The popularity of Steam in quarantine continues to grow in many countries. Over the past 24 hours, at some point in time, more than 24 million people used the service simultaneously

Need more records – Steam continues to grow

In mid-March, Steam at some point had around 20.3 million users.

Given that quarantine has not yet ended, there is every reason to believe that Steam will still update its own records for the number of simultaneous users.