I think they increased tax because one who can afford gambling even after covid-19 has excessive money and government would love to take some
.I think they badly need money, Argentina has one of the worse CoVid case and they want money and need money and they will get it in any industry that makes a profit in times of pandemic and online gambling is one of the industry that making huge profit from lock down, because people are at home and had a lot of time to play.
Who does not need money in the present time, we are all affected with the pandemic, even the richest country have struggled economically. Argentina is just raising their taxes on casinos, but they are already allow them to operate so they already know that gambling taxes is a big source for tax income and they also know that even if they will raised the tax, it will not affect the industry a lot compared to other industries.