In Europe a CNC, or at least good and repeatable saw is available at large hardware stores. You can get any product cut to any shape precisely as long as it's a rectangle. I've not noticed one that offers more than this such as drilling holes.

But even if you were to get the wood cut and prepared perfectly, there's still a lot of skill to turn that into nice desk for example, with good joinery, veneer on exposed end grain, etc and a lot that can go wrong, and you are likely to end up with a worse result than a mass produced desk for a much higher price. This type of manufacturing can't compete at all with the cost optimizations that Ikea can do. So where you see B2C in this space is built-in furniture like for kitchens. This has a limited design space so a lot of the parts are standardized, and the design can be constrained to not have the end user work on details like exposed end grain. I guess this doesn't really have an alternative mass-produced option, so the price comparison is to hiring a contractor, so it makes sense as an offering.

But it's evidently hard to get right. If you go to an Ikea that sells returned goods, that section is filled with kitchen countertops cut to the wrong length (good source of cheap wood for projects by the way).