If you receive a message you don't want you can ask to be removed. You'll instantly be opted out of receiving messages from that organization in the future. Also, like all SMS based tools, if you reply with the word "STOP" you'll never hear from them again.
But I can still receive unsolicited texts, correct? If organization X discovers my phone number, they can add it to their distribution list without my consent?
The last thing I want is random spam from any organization, regardless if you think they are trustworthy. If it's unsolicited, it's spam.
Feature request: add a platform level opt-out.
You don't really want to opt out of birthday spam do you? :-P
Please don't pitch yourself as a lesser of two evils. And I can at least cuss out / slam the door on a solicitor. And they aren't going to wake me up in the middle of the night.
Follow up question: do you respect the 'Do not call' registry?
You have a useful product that will appeal to a number of people (on the sending side). But please don't delude yourself into believing that you have a product that make the world better for all of the millions of recipients that somehow ended up in your databases.
A global opt-out is the absolute least you can do.
Or, it will result in your number being tagged as "confirmed as valid # as of (date)", making your number even more valuable to spammers. The recipient can't be sure which.