So many are just trying to sell you something. It's like if you went to visit your Psychiatrist and they tried to sell you a time-share on your way out of the office.
People deserve to be compensated for their work, obviously, but this is a space where people are looking to escape from being sold something or manipulated in some way.
If someone is building the app for themselves, it's based around actually helping and doesn't have some underlying agenda that it's trying to hide under the tablecloth.
Like a walk through the forest, the trees aren't reaching for your wallet when you turn around. The trees are just there to do some light photosynthesis before lunch, and then maybe make some pinecones that afternoon.