This is highly unusual.
First, that tire is hardly worn, but it's 3 years old. That is at least part of the problem. There are cracks on the surface of the tread - meaning the tread rubber is being worn off more slowly than the rubber is degrading. The antioxidants (AO's) in the rubber don't migrate to the surface when the tire is idle. The tire needs to be regularly exercised. That part isn't alarming.
But the cracks in the groove are. This is not normal weather cracking. There is something wrong with the tire and it should be replaced. Not right away, but in the next few months.
Further, "Budget Brand" is also part of the problem. Those kinds of tires don't use a lot of AO's because AO's are expensive. I think you might be better served to move up to "Value Brand".