The tinyx fork isn't to be confused with the TinyX/KDrive fork of the server from the past but is unrelated. The X.Org Server 1.2.0 fork is updated to work in a modern Linux environment and strips away all unnecessary code for its users. There's also tweaks for a faster X Server start-up time and other tweaks. The tinyx 32-bit binaries can be about 500kb in size.
The reason for mentioning tinyx today is that one of the involved developers has chimed in on the latest 23-year old X Server security vulnerability that was disclosed a few days ago.
The Phoronix reader and tinyx maintainer that back-ports these security fixes into their forked code-based "Ibidem", made several observations in the forums that might be of interest to those who have never dived into the X Server code themselves.
This independent developer noted that the upstream X.Org Server has a lot more of the code is unchanged in years than he would have expected, backporting of fixes to older X Servers is frequently trivial, and it's fairly quick in backporting fixes despite X's old reputation.
Ibidem also noted, "when I read [the X Server code] I'm not surprised by the number of bugs or the static nature of the code. It seems to be most fun when you have a little bit of a masochistic streak..."