It appears Salesforce was shutting down its services May 17th 2019. Reason was a faulty configuration of scripting options, that allowed users to access to all their company’s Salesforce data. To prevent worse, Salesforce shut down.
Salesforce said the script only impacted customers of Salesforce Pardot – a business-to-business (B2B) marketing-focused CRM.
However, out of an abundance of caution, the company decided to take down all other Salesforce services, for both current and former Pardot customers.
Source: Faulty database script brings Salesforce to its knees | ZDNet