The other link shorteners don't have access to your email, to your search history, to your phone, to the places you look up on the internet, etc...
We know that we are constantly logged and we still use Google. Not because we are forced to use Google or that there are no good alternative to their services. We use it because we want to use it and because they are, in most cases, genuinely superior services.
Don't assume people who use everything that comes out of Google are stupid and ignorant. I actually want Google to log all my activity so that I can have a more connected experience with all the Google services I use. Thats the whole idea, its not a sinister plan.
Google "how to stop using Google" -> "Did you mean 'how to stop using Bing'?"
- Providing our services, including the display of customized content and advertising;
- Auditing, research and analysis in order to maintain, protect and improve our services;
- Ensuring the technical functioning of our network;
- Protecting the rights or property of Google or our users; and
- Developing new services.
The information they may use in such ways includes "server logs [which] may include information such as your web request, Internet Protocol address, browser type, browser language, the date and time of your request and one or more cookies that may uniquely identify your browser."