I've considered running a blog myself for quite some while now (at least a few years) but whenever I think "this sounds like something others might be interested in" it doesn't take long until I think again and decide that it's not worth neither writing nor reading that article. Not to think about coming up with a somewhat useable Design for a blog and what should be the contents? I'd probably be stuck at this part for another 2 years without even being able to try something out.
And the main question: What for? Certainly not as a GitHub Repo replacement - just have a look around linux blogs and you'll see what I mean. Fame? I consider myself famous enough in the commercial world that once I reveal who is behind what entry on my CV it ends up being rather a question of "how long do I have time to stay?" instead of "if" I could help solve that particular challenge. No, I don't need or want fame or better public visibility - if someone really has a performance problem and really needs an expert he / she will find me, the question is wether it's sooner or later.
First thing I tell (freely and by heart) potential customers that I'm no C# / Java / Full Stack whatever Dev, if you need one of those topics badly search for someone else, I deal with SQL Server and that's about it and even there I'm far from perfect or a walking Wikipedia, especially when it comes to TSQL I'm rather on the asking than answering side around here.
If I have / find something interesting enough and it's related to SQL Server I'm happy about being able to share it through SSC - this does help the content to get wider attention right away and I don't have to maintain a Website, got enough Computing and other projects I take on regularily like "make my home ready for any kind of 4K+ streaming" or "I have this thing I'd like to have solved … how about IoT for that?".
No blog to maintain = more time to spend with rack enclosures, asset tracking and other things which I prefer over some Internet fame. Just imagine that endlessly happy guy with 2 Juniper Switches and a 3 VLAN Setup who doesn't need anything to be fixed because it was made to work and last - I get my cup of coffee offered any time I'm nearby.