BadgerBell is website monitoring, run by URLERT LLC, 5900 Balcones Drive, Suite 100, Austin, Texas 78731. This page says how we text people, what the texts say and how to stop them.
BadgerBell sends one kind of text: an alert about a monitor the person chose to be told about, when that website or server goes down or comes back. It also sends the one text with the code that confirms a phone number. We send no marketing and no offers by text, ever.
The code text, sent once when a person adds their number:
BadgerBell: your code is 123456. Msg&data rates may apply. Reply STOP to opt out.
A down alert, when a monitor the person picked goes down:
BadgerBell: [Nimbli] Nimbli health is down (nimbli.app/_health) since 14:02. Acknowledge: app.badgerbell.com/a/4KX9
A recovery text, when the last monitor in that incident is back:
BadgerBell: [Nimbli] Recovered: Nimbli health, after 12 minutes.
The part in square brackets is the project's name. It is left out when the team has only one project. Message and data rates may apply.
Nobody is added to texts by someone else. A number is added only by the person who owns it, signed in to their own BadgerBell account:

Step 2: the person types their own number, ticks the box that agrees to alert texts, and presses “Text me a code”.

Steps 3 and 4: the code arrives by text, the person types it, and only then does the number get alerts.
By ticking the box and confirming their number, the person agrees to get these alert texts. They can stop them at any time, as below.
Twilio, our messaging provider, answers these replies for the number the texts come from.
Reply STOP to any text. Or sign in, open Alerts, open the number, and press Remove it. The number then gets no more texts. Or email [email protected].
Questions: [email protected]. How we treat your data: Privacy policy. The rules for using BadgerBell: Terms of Service.