The unprecedented era of gambling on literally everything everywhere is an absolute cancer on society, made completely legal by absolute greed and degeneracy at the highest levels of government. I don't know how we put this genie back in the bottle (amongst many detrimental genies).
I mean, it's instilled into society at every level in the US. If your company offers an FSA, it's asking to make a gamble on how much medical needs you'll have in the next 1 year. The "smart" way to write the tax law would be to just let taxpayers deduct whatever medical expenses they have at tax reporting time. But instead, they want you to make a bet because you're highly likely to either (a) not use all of it and…
Conflating this with gambling is dishonest. I'll grant you that I've always viewed the way FSA is structured is weird, but this is absolutely not gambling unless you're completely unaware.
If you have any regular, annual medical expenses that are out of pocket, or plan to purchase any of the very wide variety of items that are eligible for FSA (e.g. gym equipment, many foods, glasses, contacts, etc. that might not be fully covered), then you can estimate this with exceptional accuracy.
This is not the same as playing roulette.