Whether the project is FOSS or not is irrelevant. They're seeking distribution and in order to further distribute a project needs to be able to cleanly communicate why it deserves more distribution. Ironically, based on your comment, FOSS products are generally very good at this. What OP provided was criticism, and FOSS needs and welcomes criticism to stay strong and relevant. If OP was opening a GitHub issue and berating the maintainers I would agree with you.

tldr: "They don't get paid" is not an escape hatch for genuine, level-headed criticism, and criticism is important for FOSS to stay strong and relevant.