After I created an account on Uber.com, they send me the following SMS—I translated it in English:
Uber: Welcome to the Uber platform. If you sign up for a free info session, we will help you on your way. Click here: http://t.uber.com/nlinfo2 See you soon! Send STOP to unsubscribe for further SMS
So I wanted to reply with "STOP", to unsubscribe from further SMS. However, Google Messages says that the sender does not support replies.
In the message details, we can see that the sender is "Uber" and not a phone number. Therefore, it is not possible to reply by SMS. 😕
And it looks like I am not the only one who noticed this.