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It’s pretty common to own a domain but not actually host the email server; doing on-premises email is a security PITA and most providers simply blacklist large swathes of residential and leasable (e.g. VPS) IPs.
Unfortunately, if you get someone else to host your email, they often charge by the account, not by the domain. Setting up a new mailbox is therefore irritatingly expensive.
A catch-all email works well, though, and is free from most of the hosting providers. Downside is you get spam…
Jane@JaneDoe certainly seems more common than mail@JaneDoe.
Essentially no processors follow a standard. There are some that have become a de facto standard and had both backwards compatibility and clones produced like x86. But it is certainly not an open standard, and many lawsuits have been filed to limit the ability of other companies to produce compatible replacement chips.
RISC-V is an attempt to make an open instruction set that any manufacturer can make a compatible chip for, and any software developer can code for.