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> but is bad practice

Says who/why?

"It's mean/I don't get a callout/the credit I deserve" is "bad practice"?

Why aren't you honored that your product was good enough for Google to absorb and build off of? I'd be super proud.

I have to agree. I use non-copyleft licenses because I don't expect people using the code to give me anything in return. Removing your the header and attribution is wrong, but not collaborating? As was said in other comments, if that's what you want, dictate it in your license because there are plenty of -- and dare I so most -- people that use the MIT license that don't care.

This is why free software and open source aren't the same. Free software is about this kind of fairness, among others. The simplicity of open source does have its downsides.

Why it is bad practice ... ?

unless there are legal definitions to “bad” it’s well within their rights you’ve granted them.

You can’t have a license that says one thing and then rely on implicit community norms to expect something to happen. (For one, you’re assuming the person is even aware of the community norms)