Why does Wordpress use my picture of every non-related website?

I have a wordpress blog and have my picture next to my name of course. But if I go on other websites and comment something, it will use my picture without my permission. These other websites are non affiliated with Wordpress and even ask for my email and name, some I have to create accounts for, but they still use that picture somehow. There is this only game I play too and it uses that same pic from Wordpress without my permission as well. How is this happening and how do I prevent this from happening?

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