Holy cow, did not know ios lets apps access so many finger printable information such as apps installed, last wipe and number of copy actions.
Installed the browser as I am confident it will be good also.
Sending an email from catch-all covered email is not a big issues also, create use, delete and it still works.
I am slowly transitioning to icloud from gmail, was thinking of proton but reading the above comment made me change my mind, good custom domain support is a must for me.
Hope this initiative fails spectacularly.