I received a text with a squareup.com link to a receipt from a small business where I had just paid with a credit card. The business had a terminal that looked like an iPad with a card reader. I was given the option of getting a receipt by email, text, or printed, I chose text and entered my mobile phone number. Presumably the receipts people receive from businesses they did not go to are due to people entering the wrong phone number. I doubt Square is scamming or spamming anyone’s phone number. If they did no business would use their terminals. Though someone could spoof Square’s number. So don’t open the link if you haven’t just been to the business named in the text. But if you block the phone number, remember you can’t get a receipt by text from any business using Square terminals.