If you are logged in they still have access to your activity and usage statistics which they can sell to third parties.
So it’s true that you are not ‘directly’ generating profit for them in an easily measurable way, and they would consider you among the ‘freeloaders’ that they called all third party app users.
However, you still indirectly benefit them just by using the platform. Especially if you leave comments or post content. If you just use it, lurk at most and come to lemmy for the discussions.
You want descriptive answers? Make a descriptive question.
It can be as simple as 'what is "x" and why?'