That is just shifting the blame. If you use a product for marketing, you are marketing. Yes, in general, "using a service" does not mean you are in that business. But if you ask your users to take part in this service or tool you are using, you are now providing that service.
Chairs in your office for your customers? You have taken on the responsibilities of being a host.
We can debate indirect services, such as electricity to run a website, and I would say that that line of discussion is pointless. I rely on my electric company, but my customers rely on my website, and the customers blame me, not the provider I chose to host this feature, not the electric company that provides power to the web services provider.
Remember that the customer does not care about your problems. They care about theirs, and they see you as their cause.
Chairs in your office for your customers? You have taken on the responsibilities of being a host.
We can debate indirect services, such as electricity to run a website, and I would say that that line of discussion is pointless. I rely on my electric company, but my customers rely on my website, and the customers blame me, not the provider I chose to host this feature, not the electric company that provides power to the web services provider.
Remember that the customer does not care about your problems. They care about theirs, and they see you as their cause.