Veritasium, a popular science channel on YouTube, released a video just a few days ago explaining what IQ is and how it works:
www.youtube.com/watch?v=FkKPsLxgpuY
IQ is not properly measured from a random website. If someone announced they have a 200 IQ because of some scam site, that doesn’t mean actual IQ tests are invalid. The problem is with that website, and the gullible test-taker.
Every time I’ve heard someone say IQ tests are meaningless, 100% of the time they admit they’ve never heard of Spearman or the G factor, which would have been covered in a relevant Psychology course at university.
It’s not everything in life, but IQ is real, measurable, and has value in predicting how well someone will do with various challenges in the future.