I have fond memories of starting to work for them back in 2013, which for a lot of folks I've talked to was peak Rackspace. The "Castle," a mall they bought in San Antonio and converted to office space, was thriving with folks working on cloud computing, frequent tech talks, and just a great office culture. As late as the mid-2010s, they were innovating with novel products like OnMetal, on-demand full hosts with the elasticity of the cloud, that AWS didn't really have an answer for yet. They also gave me the opportunity to work on open source full time, which was a rare and fulfilling experience early in my career.
I really thought the Castle would be a tech hub for south central Texas. I do feel lucky to have worked there when I did and still work with and keep in touch with a lot of Rackers. I wish those still there the best and hope they can turn things around at some point.