Starbucks might have to worry less about their revenue if they brought customers like me back into the fold by not firing labour organisers, and engaging in meaningful discussions about what being a “partner” in a business means.
Realistically this is your personal crusade and while you want Starbucks to change themselves for you, I doubt it would really move the needle at all on the sales slump they're having.
If I divide total transactions by total number of Starbucks, it works out around 2500 visits per week. On my own, I’m not moving the needle. But only 25 people thinking like me is a 1% reduction.