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Personally, I don't read all the TOS in most sites I'm using as they didn't require a KYC so it's useless read all that when I believe I'm not covered since they will not know my real identity or where I am living.
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This is a problem for most players. When you check the box that you have read and agree to the ToS, you are performing a legally significant action, which means that you fully and unconditionally agree to the rules and are ready to comply with them. If you are a resident of a country whose citizens are not allowed to play on this site, then you must leave this site yourself. The site should not calculate you by IP and block your access. After all, citizens of other countries may temporarily stay in your country and this will limit their ability to play.
Actually when I was on trip a few years back and tried to access bet365 they restricted my login and when I asked their support why I am unable to place bets they asked me if I am on vacation or changed my country of residence and I said the former obviously. They then asked me to make bets once I return to my residence country so maybe this is something crypto casinos and sportsbook can implement too if they want.
Seems you are not using VPN that time mate so they tracked your IP address and appear that you are using IP address in which comes from countries banned on their site.
A player does not know if the website allows users from their country and at least the website should open a popup that reads, we do not accept members from your country, then 2 options: A- I am not from this country B- I am from this country, exit. This allows players to know they are breaking rules if they select option A intentionally.
This is how VPN is very important mate and the bad thing about your experience is you came don't know how to hide your IP address so checking is too easy for you.
Well, the main solution on how to deal with this is to avoid those sites,
Sometimes you will be at the places in which gambling is restricted or the sites you use to play is banned,option will be in place once this happens.