Bitcoin's logo is not like a logo of a Business where they iwn the copyright and trademark for it.
nice explanation here but only if its the orginal bitcoin logo but there are other logo that is created by a certain company or designer and some of them has a watermark .
this is not good if we search for some logo on the web and steal thier logo but why cant we just create our own personalized logo ? its not that hard because we are only gonna be using the
BTC logo as the main character/subject .