Regardless of whether or not you provide your own SSL certificates, cloudflare still uses their own between their servers and client browsers. So any SSL encrypted traffic is unencrypted at their end before being re-encrypted with your certificate. How can such an entity be trusted?
people selfhost for many different reasons. you may self host so you can degoogle, but I selfhost so I can put Kubernetes/mqtt/zigbee/flask etc etc etc on my resume