What shall they do with people who don't see ads because they connect through IMAP with a traditional email client? I rarely use the web client. Does that mean

What shall they do with people who don't see ads because they connect through IMAP with a traditional email client? I rarely use the web client. Does that mean I'm stealing from them? If they offer the service for free through third-party clients, then what difference does it make I block ads in the web client?