How will anyone find your site in order for it to become popular, if Internet giants gatekeep the only methods that people use to find or access things?

Internet giants control your browser, your smartphone, your search engine, your digital assistant, your DNS, most of the traffic going through CDNs, advertising, online shopping, app purchases, news, etc. Most of the internet is only accessible through the giants. Most of the experiences people have with the rest of the world is through them. (I'm being charitable; it's likely all the experiences people have with the rest of the world is through them)