Absolutely wealth is critical and way, way beyond funding. You don't play at a serious level as a kid if you're genuinely poor for so many reasons. A poorer, more populous, country with higher density living has relatively much more expensive access to playing fields. In chess it's more likely to be a function of tradition, interest, free time & resource availability (computers seem like they might be important but wtf would I know about it or how many in India have readily available access to play games?) Potentially health & nutrition of pregnant mothers could play some part in some of it for some individuals and may not be equivalent across all national borders. Domestic culture and whatever class and or caste system is influential in getting access to playing in the best competitions as a junior really matters.

New Zealand is wealthy, has more playing fields than they can use, anyone who wants to can afford to play and is welcomed - even more so if they can join in and help /us/ beat those bastards from across town for whatever value of across town is most relevant to the particular team. There's a metric fudge-tonne of old cranky bastards who want to tell you what to do to do it better, not all of them are useless either. At least that's my read as a foreigner who visited once. The proportion of New Zealanders who trace their heritage to the sub-continent is likely pretty small (wikipedia says 5%). The proportion of the New Zealand national cricket team who trace their heritage to the sub-continent is quite large in comparison (~30% depending on who is selected this week?) There was a test match recently between India and NZ where all the wickets in the match were taken by people tracing their heritage to India. Cultural tradition might have something to say about that too.

Likewise Norway is close to the richest country per capita in the world. Hard to think of anywhere you'd rather be if you were bringing up kids and in the bottom 10% of wealth & income. If your kid takes an interest in chess they are likely to be able to pursue it, is my guess (Norwegians can pipe up to say how ignorant I am if necessary). Not true everywhere in the world.