Some slot machines do. Some slot machines have a fixed wager. Does that make them not gambling?
And I’m not sure what the relevance of casinos having more than one type of gambling is. I’ve worked in the industry more than 30 years, and not once do I remember a regulator saying “it’s OK, as long as you only do one of these things, you don’t need a license.”
You seem to be trying to define sports wagering as the only thing that qualifies as ‘gambling’. Casinos would like a word (or actually, they probably wouldn’t, they’d love this world of yours where casino games are apparently not gambling.)
(And trust me, if all that was required for a slot machine to avoid gambling regulations was “you always get something back”, they’d all be paying 1c or giving you a discount voucher for your next Happy Meal on every losing spin tomorrow.)
That sounds sweetly naive. “Producing innaccurate technical advice, with a confident tone, at scale” sounds like the perfect credentials for a career in consultancy.