> nobody had actually asked for one and the person didn't even make wedding web sites
> There was no actual case
303 Creative v. Elenis started out because the web designer sought injunctive relief from a Colorado state law that would have made her unable to refuse to make a website for a same-sex wedding. She had received a request to make a wedding website (for a heterosexual couple), and preemptively wanted to preserve her right to refuse in light of the Colorado law and to put up a public-facing notice stating as much. The case was appealed all the way up to the Supreme Court by the designer herself.
It doesn't read to me that any standing was "invented" here. Notably, the dissent in this 6-3 decision does not discuss standing at all; and in fact, the Tenth Circuit that decided against the designer (prior to the SC appeal) did find that she had standing.
It sounds like you have your own personal gripes with this decision, which is fair, but an attack on the grounds that there was no standing is misguided.