Starbuck and mc donald are sponsored pokestop. Bussiness might be eligible but may not be acceptable if its chain or generic. You need to highlight how the business is good place to socialize or explore
You may want to read here
Are you getting warning? Submitting those business wont give you warning unless you submit them in wrong location, use 3rd party foto, or other abuse. You can appeal in the link inside email given to you. I assume you got warning and not suspension.
