Trademarks don't need to be registered and many trademarks simply exist through active use.
However, your second paragraph is the key one. While trademarks don't need to be registered (and, in any case, trademark registrations are mostly on a country by country basis) it's pretty much on you to spend the money to defend your trademark if you want to do so. No one's going to do it for you.
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IANAL.
Trademarks don't need to be registered and many trademarks simply exist through active use.
However, your second paragraph is the key one. While trademarks don't need to be registered (and, in any case, trademark registrations are mostly on a country by country basis) it's pretty much on you to spend the money to defend your trademark if you want to do so. No one's going to do it for you.