Earlier quoted context omitted.
Because a random bakery shop is totally like a pseudo-monopolistic social media giant that can censor millions arbitarily and at will.
it's not a monopoly because there are alternatives, and it only has a 10% market share in the US ( https://gs.statcounter.com/social-media-stats/all/united-sta... ). The bakery also sets precedent as it did go to the supreme court, and it was used as a rallying cry by politicians on the right.
And whether a bakery serves your gay wedding or not is perhaps the most petty and inconsequential thing to be upset about. There are thousands upon thousands of bakeries in a large city. You can learn how to bake a cake in a weekend and home-bake your wedding cake yourself, or any one of your wedding guests can do this as a wedding gift. You can go to a no-gays-allowed bakery but simply not tell them you're gay, and take a finished cake from them then write your own name and that of the guy you will marry on it yourself. You can not get cake at all and instead get any of the thousand other types of wedding sweets and food.
It's almost like the whole thing is a hilarious non-issue that some people just invented to cry and act like victims about.