I don’t really know much about that except for the fact that it does not have any form of a digital transponder that actively sends data it could be storing it though. Here is a site about vehicle privacy where I just looked up a random gen 3 Prius vin. (https://vehicleprivacyreport.com/report/?vin= JTDKN3DU1A000806#)
You could try Firefox relay or addy.io.
Edit just remembered that one of my favorite throwaway email sites is tmail.link all it is is pure HTML with minimal CSS and doesn’t even need JavaScript to work. Sounds like it’s made by someone affiliated with Njalla.
Completely, if op really needs to maybe use whoogle or startpage (there is some debate on if they are private or not since they were bought by system1, more info about it https://restoreprivacy.com/startpage-system1-privacy-one-group/ )
Yeah I do its pretty good just know that no email is truly private. Overall its decent and I don’t see a reason not to give it a try. Video on email: https://inv.zzls.xyz/watch?v=iH626CXyNtE
I second librewolf