Yeah, that's what I figured. Considering the last legit-looking registration was from late 2017, I'm not too worried. I'll check it periodically, but I don't think it's going to require much in the way of maintenance.
I've also strongly considered jumping ship to another forum given SMF's frighteningly slow development pace. The last bugfix release of SMF 2.0 came out in November 2017. That's a long time for a PHP application to go without security fixes, and I constantly worry about having to deal with more than a few spam bots. I do have Apache running under its own user so I'm not too worried about someone rm -rf'ing my server, but you don't need root to make legit servers do some nasty things.
What's worse is that they aren't even keeping pace with PHP. I dare not ask how much many times the string "8192: Function create_function() is deprecated" appears in my SMF database. That was deprecated in PHP 7.2 (which was released over a year ago) and Simple Machines seems to have no plans to fix the issue. Sigh.
Upgrading to SMF 2.1 is also not a viable option, since the latest packaged beta was released even before 2.0.15 (June 2017). Sure, development is active on GitHub, but I'm not going to go through that song and dance.
So I dunno. Maybe I'll flip back to phpBB. I never thought I'd say this but that seems like a far better option at this point. They're actively releasing builds and third-party support for it has always been strong. I remember testing phpBB 3 when it was still fairly new and it was pretty solid (far better than the mess that was phpBB 2...woof), and I can't imagine it would have gotten worse over time.