Maybe I'm missing something, but why don't they start RISC-V development too?

It's clear that their completely locked ARM processors will not succeed forever. But the processors and silicon IP they would design for RV would still be theirs and they could licence this to other manufacturers. Also providing good services and customizability is worth a lot.

I had that as well. Didn't feel any real benefits/effects from it and also no abstinence symptoms but drank coffee occasionally because of taste.

Then my high blood pressure was discovered, I was put on medication and since then I feel the rush of caffeine and unfortunately the headache after withdrawal as well.

tutorialspoint is similarly bad, they are mostly SEOed sites. Sometimes also giving wrong or misleading information.