SE sites used to allow anyone to ask questions in guest mode, with a user name of the form userXXXXX . See this question. This is particularly valuable for sites which often involve legal or interpersonal issues; I was going to ask such a question this morning.
That is why I learned that, if you go to academia.SE in incognito mode and attempt to ask a question you will now see this screen:
Moreover, the site will not simply let you create an account with a fake e-mail address, but will send a confirmation e-mail to the address you enter, so you need an actual throw away.
I am annoyed. While it is obviously possible to get a throw away e-mail and set up a throw away account, this is adding extra hurdles. Was this really necessary to keep out spam?