Thanks for sharing your reasoning but you're asking for far more than a logo on the homepage. Perhaps you could add a checkbox at signup that says something like, "Will you allow us to use your company name and/or logo on our homepage?"

That will give you a good idea of how your customers feel about this. It's probable that many people are signing up for your service and are not authorized to give you permission in the first place.

Good luck to you and your team. I'll think about sending in the email you mentioned.

Thanks for your answer. That would be an idea, but it's still an additional checkbox and we like to keep it simple, because asking thousands of users just to use 10 or 15 logos does not really worth it.

But I agree that theoretically T&C allow us to do more than using logos on our own website, I'll try to find a way to add a restriction on what we can do without explicit consent.

Thanks! (my nickname is simply 'damien' in my pro email address if you want to send me directly the mentioned email)