This is just an observation and not a comment on others' motivations or morals.
I used to do the Listener but stopped a few years ago. I restarted after lockdown after seeing Tatters' link. I did do it 'for free' for a couple of weeks but then started buying the Saturday edition for the Listener and other Mind Games content. As a long-time Guardian and Independent/i reader I also enjoy the rest of the paper.
So, if my experience is anything to go by, Tatters has helped encourage sales.