In the US, it's true https://www.uspto.gov/sites/default/files/documents/BasicFacts.pdf https://www.uspto.gov/sites/default/files/documents/BasicFac... USPTO

In the US, it's true https://www.uspto.gov/sites/default/files/documents/BasicFacts.pdf https://www.uspto.gov/sites/default/files/documents/BasicFac... USPTO is largely a negotiating, registration and notification apparatus. It has no ability to enforce your trademark beyond what you are willing to do. See page 9 of this USPTO document. It is expected that you will do all the legwork to defend and determine your ownership of a trademark. If you do not, your trademark could be eroded or infringed and left undefended long enough the infringer could potentially file opposition if their use of your mark exceeds your own.