The only other alternative I have found that doesn't require registration is submitting through product feedback on devices:

Apple

Feedback - iPhone

Apple wants to hear from you. Send us your comments and feedback about iPhone.

You can also retweet my tweet or write your own tagging Apple and Tim Cook:

X (formerly Twitter)

Uncle Rockstar Developer (@r0ckstardev) on X

gm 🌞🌻 reminder that @apple @tim_cook are still threatening removal of @jb55's @damus app Deadline is June 27th, hoping they reverse decision...

I would've tagged Phil Schiller who oversees AppStore, but he deleted Twitter account:

Yahoo Tech

High-profile Apple executive overseeing App Store deleted his Twitter account, which had over 200,000 followers

Phil Schiller, an executive for over 30 years, deleted his account over the weekend. It came after Elon Musk complained about App Store fees.