Any copies of the code should include the notice according to the MIT license. I do agree that I could have used a less permissive license, and it is something that I am now considering to change.
The reality is that licenses do not mean anything unless you are actually able to enforce it. So I really do not think the license would have mattered in this case.
Licenses absolutely matter, that’s the whole point of using them! Big corps will absolutely not risk being sued over infringement, it’s not worth it to them. For the litigation cost they’ll throw a couple engineers and redo your project from scratch.
Sorry it happened to you but it seems like you just picked the wrong license.
The reality is that licenses do not mean anything unless you are actually able to enforce it. So I really do not think the license would have mattered in this case.