Honestly, there's a time to ask, "could I run this on a single server LAMP stack?" If it matches what you're doing, it'll work for years-decades with a little care and feeding. Can be self-hosted, or if you host elsewhere is a common denominator of service.
That might require a little bit more security knowledge than I practically have, with respect to securing servers in cloud environments. That was one of the appeals of PaaS platforms, to me. At least with Kubernetes, you're based on things like Container OS, which to my knowledge are secure out of the box (zero config).
Me, setting that up from scratch on a single VPS, that might get hacked if I mess it up, and then my customer's availably is compromised? I wouldn't want to be in that situation.
