Thinking about just using my personal gmail email for my AW account so I don’t miss notifications. Is that safe? Like, will other users or service providers see my email if I email them on through their profile or does AW keep it hidden?
If the MOJ, Co-op, M&S etc can be hacked, it doesn't matter what security a site has, the answer is
NO.
I have a generic email address that I use for all sorts of things, so that my name is not revealed.
Set something up generic and easy to use and remember, e.g. masteroftimeandspace@ twoplustwoequals@
Do not link it to any device, unless you have a dedicated punting phone.
Also, just bear in mind that AW log your IP address against your profile, (as do many websites

) - so having multiple AW logins will have AW group them together. SP's can see these groupings.