As a former enterprise person, this clearly states “exiting growth cycle into low-staffing maintenance mode”; Salesforce must have bought them to kill a price-beating competitor to multi-year Salesforce PaaS contracts, same as Okta did with Auth0. Investors are typically-majority short-sighted and only care about growth-cycle revenue, so once they reached market saturation, they were ripe and duly reaped. So long, Heroku.