Deta Space appears to be very lacking in the product details department. I see a comment saying you can't self-host it, so it has to be on Deta's cloud, or can you even bring your own cloud provider? Is there any technical/security guarantee's to Deta's privacy claims? For one, a casual reading of their privacy page suggests they integrate a half dozen analytics (aka monitoring) tools including Google Analytics.
from the looks of it, I assume Deta is some sort of PaaS, and aims to be a hybrid between Heroku and Glitch. It's an interesting space to be in, but the product's maturity leaves a lot to be desired. If you have concerns you should probably just be using Heroku or your own homegrown solution in IaaS/Bare Metal.
Deta Cloud (deta.sh) is a PaaS like Heroku. Deta Space (deta.space) on the other hand is something new we call the "personal cloud". We will announce more soon.