Yes it's true that non-registered trademarks are a thing too. There was an interesting case in Australia about an unregistered trademark and who owned it after

Yes it's true that non-registered trademarks are a thing too. There was an interesting case in Australia about an unregistered trademark and who owned it after an acquisition of the product it was associated with: https://www.claytonutz.com/knowledge/2019/may/a-fight-about-much-more-than-peanuts-licensing-unregistered-trade-marks-after-kraft-v-bega https://www.claytonutz.com/knowledge/2019/may/a-fight-about-...