Hello, thank you for your response. I’m not the one running the text advertisements; some customers are sending bulk messages using bitly.com on sub-sites of the multisite without permission, which keeps causing our hosting to go down. Therefore, I intend to detect which sites are using bitly and stop those sites.
As you mentioned, when I checked the links in the texts using Safari on my iPhone and Google Chrome, the referrer is empty and is registered as direct.
I have a question regarding this. The card company is sending messages on behalf of customers using the website URL provided by them via bitly, so we do not have access to the bitly account itself.
In that case, regarding the UTM URL building you mentioned, such as https://site.com/?utm_campaign=sms-campaign, I have created it using a WordPress plugin like Easy UTM Builder, but how can I create something like sms-campaign to detect it?
I would appreciate your help.