Whoops, apologies for missing this! For our core cloud product, we only partner with established providers. Large-scale compute wholesalers with $5m+ of compute each in secure data centers. These companies' entire businesses are built on selling secure compute to customers like us and other medium/large businesses. Basically, this isn't some random dedicated server host off of LowEndTalk :)
We have data protection agreements with all of them, and we can also do bare metal machines on request so that you have full control over your physical machine.
Lambda/Paperspace/Coreweave do own their own servers (Lambda being the cheapest). That alleviates some security concerns.
It all depends on your security requirements though.