I just signed a petition for a cause I believe in, sponsored by an organization I care about. The petition happened to use a well-known online petitions platform.
The logo on the top of that site was for the platform.
The thank you email that landed in my inbox after I signed the petition was from the platform's email address.
That platform's logo was at the top of the thank you email. Its name was in the footer.
The thank you email was even signed by the platform's team.
When all was said and done, it was hard to remember whose petition I had signed.