The restrictions on gambling has always been on age and not class or even financial capabilities, there are restrictions based on countries too which I don't fail to recognize too.
Yes, and I'm very sure that age related gambling restrictions will exist forever. Because a kid or those who are underage don't really understand that how harmful gambling could be for them. Even if young people get addicted to gambling they can later find out a way to reduce the impact of that addiction when they learn about gambling responsibility but someone who's underage won't be able to give up on that addiction and that will cause huge problems in his life. In some places even underage people can use an online casino by faking his registration age at online casinos, however they won't be able to get their KYC verified due to the age restriction.
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Yes, there are some casinos that don't have any such limits or restrictions but I guess they must have age related restriction in order to stop underage people from using their platforms. It could cause huge problems if a young gets addicted to gambling.