You specifically said you chose the MIT license because you wanted to use it in commercial projects. That’s business, no matter how small. As the owner of the property, you could have used any and all licenses available to you. Also, if you wanted to require users of your code to attribute or notify you, you could have. If you want to be disappointed in their behavior that’s perfectly fine, too. Corporations usually disappoint if you have any altruistic expectations of them.