Anti-spam rules apply to telephone messaging as well as emails. Anti-spam is not just about bulk messaging. It only takes one text message or one email to be found liable for breaches of anti-spam legislation.
If you have a new business and you don’t use one of the common auto-responder or CRM services like Aweber or SalesForce then you might not be complying with anti-spam laws. If you are non-compliant and there are enough complaints made against you, your text or email system can be blocked or cancelled and your whole method of communication disrupted. Do you want to be blacklisted and lose the trust of your newest customers before you even get a chance to show them what you’ve got?
Being anti-spam compliant is so EASY I am constantly surprised at the businesses that don’t get it right.