It's basically a marginal position at this point to be outright pro-union, even more so to be pro-nationalization / pro-interventionist. Apart from outliers like maybe Bernie Sanders, an explicit working class orientation has been taken over almost completely by the populist right, and much of the self-identified "left" speaks mostly to the concerns of the upper middle class. Not just the mainstream of the US Democrats, but even much of what is spoken about by "the squad", or the Canadian NDP party.
Regular working people are not the audience anymore.
If a part of your platform is "No immigration" it becomes very difficult to distinguish that from "No immigration (because I don't like brown people)".
Specifically in the case of Starbucks, progressives do not think they are.
Does anyone besides me remember that CEO Howard Schultz thought he should be president back in 2016? This whole thing just makes me want to shout from the rooftops: We do not have a left-wing party in the United States! The Democrats are anti-union and pro-austerity. We have a center-right party and a far-right party, that's it!