Armin,

  We appreciate the feedback, however Spam Registration is not a bug on our part. It is an epidemic that affects the entire internet community.  It is not as simple as saying, "I have identified the issue, now fix it in the next release please."  I would love it if this were no longer a problem for DNN, but the fact remains that it is a problem for any website (not just DNN sites) that accepts public registrations.  This problem is the reason that products like reCaptcha exist.  Given that Google with a dedicated team, led by some very brilliant computer scientists, is unable to solve the problem, then I am under no illusion that the DNN community or DNN Corp will suddenly solve the issue on a single release.

We will continue to work on improving the DNN Platform to deal with SPAM bots and already have some plans in the works for 7.4.0, but I only expect to get an incremental improvement in this area and not a magical cure all to a problem which has plagued the internet for the better part of 20 years.

"You could have stopped this over a month ago for everyone"

That's not quite correct.  It would only be stopped for people prepared, able, and willing to do an upgrade to the latest code.   All those people would have to do some work anyway.  They could spend that work time on manually creating a login page.  I don't see a massive net win.

"You do realize that many website owners have no idea this is even happening... "

None of those are going to upgrade to a new version.  As you point out they don't even know they have a problem.  Making a code change would not help them.

"none of my non-dnn websites are having any issues"

I'm very pleased for you.  It tells us nothing useful.  A few seconds in google finds people complaining about thousands of spam registrations per day in Wordpress (https://wordpress.org/support/topic/how-does-one-stop-spam-user-registrations). I'm sure it's just as bad in the other CMS's.

OTOH I have DNN sites that get no spam registrations and I have DNN sites that do.