Brazil is preparing for a fully regulated market in January 2025, all the blockings were timed for this upcoming event. All sites that did not comply with the requirement to obtain the appropriate license by September 30 were blocked, but all players were given a grace period of 10 days so that they could withdraw their funds. Now those who were blocked will decide whether they want to operate in a country with such a regulated market, maybe not all will care about obtaining a license.
The move they took is indeed a good one in forcing the hand of the casino owners, and I come and register and fully be regulated. That's if they value the population of gamblers. From there, some business owners just don't want to pay tax and follow laws.
Some among the 2000 will definitely comply with why some will want to leave the market or will want to operate illegally using whatever means they know, which will be a double risk to them.