In any case, attempting to use a derogatory or denigrating euphemism to refer to something is usually less productive than simply exposing (what you perceive to be) its faults. What specific issues do you have with these markets/exchanges?
(And I got the term "gambling exchange" from the UK where Betfair Exhange basically does what Polymarket do since 2000, without the Crypto glamour.)
"Binary options are gambling products dressed up as financial instruments. By confirming our ban today we are ensuring that investors don’t lose money from an inherently flawed product."
https://www.fca.org.uk/news/statements/fca-confirms-permanen....
Sound familiar?
They also highly regulate CFDs and other financial instruments that are marketed to retail.
Congrats on using the worst argument in the world: https://www.lesswrong.com/posts/yCWPkLi8wJvewPbEp/the-noncen...