This does not match my experience at all. You may see tip jars in those places, but there is never an expectation (in the soft-obligation sense) that anybody tip into any tip jar ever. The only place where tips are considered soft-obligatory are waitresses and food delivery, and in those cases you leave the tip on the table or hand it to the person yourself. Tipping into jars may be desired but is never expected.
Are you perhaps an immigrant to or tourist of America? I can see how foreigners might get confused by the tip jars and not pick up on this nuance since it isn't explicitly spelled out anywhere on the jar, but I don't think people integrated into American culture perceive any sort of obligation to tip into jars. If you sit in a shop and watch people order, you'll surely see that the overwhelming majority of people never put anything into the jar.
(From what I have seen in Canada, all of this is true there as well. Tips for waitresses are socially obligatory, while tips into jars are not.)