The links are for a site called gopwin.us with a referral code at the end of the URL for each different text message. When you go to gopwin.us, it redirects to WinRed. I just went to the contact page for WinRed to see if I could speak to someone to opt out of these messages, but they direct you to this explanation that the texts are not coming from them directly.

The links are for a site called gopwin.us with a referral code at the end of the URL for each different text message. When you go to gopwin.us, it redirects to WinRed. I just went to the contact page for WinRed to see if I could speak to someone to opt out of these messages and there is a note specifically stating that the texts are not coming from WinRed, but they direct you to this explanation that the texts are not coming from them directly.