From my understanding, open source encryption is actually better for privacy than closed source, since then you can have external auditors. Basically, encryption is doing a TON of math involving prime numbers, so even if you know the algorithms used, you still won't be able to figure out what the secret (or password) is without using inordinate amounts of computing power.
For more reading, check out Kerkchoff's Principle
Love is a strong word, but kubernetes is definitely interesting. I'm finishing up a migration of my homelab from a docker host running in a VM managed with Portainer to one smaller VM and three refurbished lenovo mini PCs running Rancher. It hasn't been an easy road, but I chose to go with Rancher and k3s since it seemed to handle my usecase better than Portainer and Docker Swarm could. I can't pass up those cheap mini PCs