Instagram don't support clickable links posted in Edit Profile->Bio field. You can only put link to Edit Profile->Website field, but this not support mailto.
But you can switch your account from Creator type to Professional type.
Click on ☰ menu on in the upper right corner. Select Settings->Account and below you will see Switch to Professional ...
From the Instagram Help Centre page (same page link you have given in your question):
You can always report strange emails to firstname.lastname@example.org.
So, you don't have to click on the link in your email. You can forward this mail to Instagram directly.
Yes. So long as you are interested in the followers of Instagram accounts you know, this is possible. While a request to that URL will only return 100 followers, an automated repetition of that request along with some kind of scraping of the results modal will give you a full list of followers.
One way to accomplish this automation is by using PhantomBuster'...
They want Instagram to be mobile only. Instagram was always mobile only until recently they added some desktop functionality. It would make sense that they really want to differentiate Facebook from Instagram. They may do messaging on desktop in the future, but it's probably not likely.
From a marketing standpoint, impressions on mobile exceed impressions ...
You can block a person who deactivated their Instagram, if you have exchanged private messages with them. Just go to that person private message in the inbox , then go to settings, and the press block sender. I promise that person will be blocked, even if they reactivate their account.
As of May 2020 the only way I can access content on a desktop without logging in is this browser extension (tested with Opera). I tried all other options, but none of them work anymore after Instagram's latest push of forcing login to see any pics/videos.