They are more noscript friendly ... except for the mandatory bot check. Sad that this is what the Internet has become.
Not to mention, many "maths challenges" out there are nothing more than a 'wait loop' in the end. Namely, you could replace them with a HTTP hard refresh timer with human scale wait times in order to get the same pertinent result. Those are actually even worse because they are pleasing the whatwg cartel since those are made to work only in their web engines.
The least they could do is to standardize those 'maths challenges' and make them HTTP header friendly.
Whereas number crunching actually ties up some CPU time.
Their only purpose compared to such timer, is, in their current state to create a hard dependency on exactly the web engines of the whatwg cartel and do exclude low end hardware (this does create a barrier of entry for new hardware or small hardware).
At least, they could have had the decency to design some "HTTP" specs to de-couple those maths challenges from those abominations which are the web engines of the whatwg cartel (maybe that's the case).
Yep, I could bet that a lot of BOTs are now based on those abominations (and probably using neural nets). You also have click farms with real humans.
There is so much wrong there... well Big Tech...