Comparing Brazil and Chile is worse than pears and apples. The only thing they have in common is that they are both NOT dolarised unlike most other latin countries.
Yes Chileans have their language that is somewhat distinct to other Spanish speaking countries, but it differs accross Chile as well. On the other hand in the South Chilean and Argentinian Patagonia are very close by language and culture for example. They gamble a lot, but nr. 1 is rodeo (not the US style).
They are proud, they think they are more than other Latinos /they really are just more annoying than others, the country itself looks different only on the surface/.
The problem is as always banking. They have their own system for credit and especially debit cards, which is a total disaster, to pay you need like 3 passwords and RUT/SSN number and still the debit card has some crazy limits. Most people have just those cards and basic bank accounts /cuenta vista; cuenta RUT/. Those accounts support grey economy= are not checked by tax office and have limits like 2-4K USD per month. Just rich people have cuenta corriente with credit cards. Webpay/Mercadopago would be great but I do not think any casino can push this through. Those platforms are too big. But I may be also totally wrong with this.
The country has on the other side well developed bank account transfers which are instant and they are quite used. But banks are regulated, which makes difficult to collect substantial money. Still I think bank transfers is a wy to go for casinos in Chile. There are options. I met one jewish guy who is doing just that. Also there incredible amounts of immigrants who are selling their bank accounts to everyone including drug dealers.
So you need to look for affiliate program who promotes bookies/casinos, who understand that Chile is not Brazil or Venezuela and not even Peru. For me it is 20bet/22bet/ivy/hellpartners/tony all one group or 1xbet (same group works ok accross latam). Still the market is small and I do not understand why people make first a website and then they look for monetization.
Edit: from the group above I think Tonybet has Chile as target market, so I am promoting in Chile Tony.
If you talk to God, you are praying; If God talks to you, you have schizophrenia.