I consistently do well on them and if a company give me one I feel it increases my chance of getting the job as I like to think I'm quite a lot better at figuring out stuff than I am at smalltalk :-)
It might help though that none if the serious IQ tests I see here include any writing: they all consist of pattern matching and other puzzles.
In fact thats a major point for a good IQ test I've been told: ideally it should give the same result for equally smart persons even if they were raised in vastly different environments.
No. Any filter in hiring that adversely impacts a protected class and is not closely adapted to the work being done is illegal as a violation of the law prohibiting discrimination against the protected class.
The case in which this legal principle was established involved an IQ test being adopted as a direct replacement for an overt policy of racial discrimination, but IQ tests as such are not illegal (indeed, a much more recent case has upheld a police department using such a test and treating a too-high score as a negative factor in hiring.)
Of course, the pervasive mythology that IQ tests are prohibited itself makes them riskier, because an applicant who is turned down is likely to have encountered the myth or talk to someone who has, and seek legal help to challenge an IQ test, where they would be less likely to do so for other tests.
Here's another kind with (broken) word association problems from FirstBank looking to hire developers: https://imgur.com/a/QXlKC
In particular, stay away from anyone funded by Vista Equity Partners because they enforce IQ tests during hiring for all of their companies. That's overlaid on top of a whiteboard assessment.