Is all depends on the regulation and laws of the county exchange operating, some of them cannot take any gambling transaction mosthly for the country who really restricted about gambling maybe on some countries who have idolized religion.
In our country, the only concern of the government is to tax Axie Infinity earners, while gambling is treated differently as it's illegal. So to make it short, gambling is not allowed while Axie Infinity is allowed but everyone has to pay taxes on their income.