I tested as a genius level IQ in elementary school. I went to special educational programs in grade 4-5, then a school with a stream just for "enrichment learning" (bused in with other kids) from grade 6-12.
I tried pot for the first time at 12, was a typical stoner at 15, and went into the intellectual pursuit of "working in a kitchen" until my mid-20s.
My family was financially and socially stable enough that I could move back home with my parents at get a degree in Computer Science when various medical conditions prevented me from working as a cook any longer. I would have had a minor in "Math" had my university handed those out (they started a year after I graduated).
I in no way excelled. I had a decent GPA but it was hard work and my mature student status that got me through that first year back and kept me in it to get a degree. I couldn't handle being in university any longer so I dropped out of the Masters program.
I have I had gone to university right out of High School I probably would have failed and gone on the same path. My genius IQ did not set me up for curing cancer. It set me up for "I don't have to study to do well in school" and let me figure out "I can stage in different kitchens to travel around and see the world while also in a job that doesn't care if I am high all the time".
Giving me a guaranteed income would have probably stifled even that little bit of ambition.
I do think there's room for giving kids who didn't have the millions of squandered advantages I had some financial help but it should not be based on IQ.