I can only speak from a UK perspective, but many financial instruments can be used in a gambling sense by retail "investors". In 2019, our regulator banned binary options, saying this:
"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.