They are until they aren't. My grandmother had a puncture and almost died

There is still the rush of perferating the colon, but I assume it doesn't happen very often. Cologuard has got to be cheaper though.

>"Risks? The risks of a colonoscopy are crazy low though."

Not at the statistical level. Death rate from complications is about 1 in 10,000: https://www.endoscopy-campus.com/ec-news/risk-of-death-from-...

2 to 3 colonoscopies per ~1k to 2k people cause severe rupture of the intestines that require urgent surgery.