As someone who spins and felts, the fibers in lint are too short for felting too. Both spinning and deleting require the fibers be long enough to tangle and lint is the broken pieces of fibers that have fallen out of threads already. You can get it to stick together like felt but it won’t ever be sturdy like a felt because the fibers can’t get wrapped around one another or tangled up. Like trying to give dreadlocks to a guy with a buzz cut.

Some people use dryer felt to add color to felted things they have made but I think of lint like the crumbs at the bottom of the cereal box or chip bag.