I don't know the worst, but juice is not worth the squeeze in my opinion. If you recall, Ticketmaster was just recently hacked, so the worst pretty much happened in that any data they had collected on their users is potentially been leaked. So if they can't protect that data, then I'm not participating in giving them data.
Sure, but the data you give them is pretty much a condition of attending their shows, not whether you use their app, Chrome, or a PC in the library to buy the ticket. Regardless, they will get some contact and basic financial info for you unless you avoid all their concerts (which is certainly a principled and defensible choice!)
They do not need to know my address, my phone number, credit card number or any of the other BS that "they need" including my name. Their website has a ton of trackers uBlock blocks, so their website is trying to collect even more data than what their "forms" request.
Of course they list those things as things the app 'collects,' because the app literally asks you for all that info as billing info when you buy tickets in that app and when you provide it, it collects it. The app isn't somehow extracting your personal info from some API. Yes, it's probably got the same adtech as the next app, but overall it's just collecting what you tell it.
I don't know the worst, but juice is not worth the squeeze in my opinion. If you recall, Ticketmaster was just recently hacked, so the worst pretty much happened in that any data they had collected on their users is potentially been leaked. So if they can't protect that data, then I'm not participating in giving them data.