It might actually have been that which caused a difference. It’s not listed on the notice, but you can see where they announced no longer supporting Balkan area, which would include Latvia.
That said, it’s as @rodrige said, that many places around the world have had support rescinded while Brave is working on a number of issues. One of which has been changes in policies and regulations. This isn’t just how governments are establishing things for themselves, such as how India had been looking at trying to ban cryptocurrency, but also in how governments impose sanctions and restrictions on each other.
On top of that, there’s been “fine lines” in laws. For example, they might say you can’t have Proof of Work (PoW) but they’ll allow Proof of Stake (PoS). Then you end up with other types like Proof of Burn, Proof of Activity, Proof of History, etc. So when changes come into play, there’s a lot of attention that has to be paid in order to make sure they are in compliance with each government. Not only for that government’s laws, but also for international laws.
This isn’t just about cryptocurrency, but it’s also on fraud and other areas along the spectrum too. So making sure proper documentation is being kept, everything is being properly verified, and all necessary information reported to governments. As you can imagine, there’s a lot of moving parts, which is kind of what is taking so long. Unfortunately Brave moved a bit too fast in adding regions before and now they are having to revisit everything and get systems set up so there are no issues moving forward.