Why? Commercialism.
Founders sell to the highest bidder to make their exit worthwhile for themselves, not caring about the future of the product (and customers).
It's a no-brainer that a commercial company like Salesforce (it's in their name!) doesn't have what it takes to build AAA software, but focuses on maximizing their profit. They drove away their best staff, focused on the wrong features, and are seemingly overwhelmed by maintaining their purchased software, all while probably not even realizing their demise.
We should all come to the agreement that takeovers of fundamental software by incompetent companies should be seen as a hostility towards every current user of said software.