The apparent growth in the market may be real, but I suspect it will be short lived as governments and authorities stem the advertising, and investors turn towards opportunities that are less ethically unpleasant. Here in the UK every other ad on late night commercial TV is for gambling apps or services, while consumer-affairs radio programmes are exposing a rising tide of financial ruin fuelled by debt, low wages, under-employment, with gambling never far away.
If I understand your comment, gambling is explicitly disclaimed by AL's Stack. Surely that's another signal for you to consider. Many organisations are shifting away from unethical investments (for whatever definition of ethics they adopt). Gambling seems to have passed its peak some years ago, both in terms of opportunity and social acceptability.
So I'm genuinely curious. You're at angel/incorporation stage. Why aim for the gambling industry?