Every scroll is meeting a need, boredom, stress, a moment to avoid something. Block the app and the need does not vanish, it just hunts for the next feed. Replacement apps solve this differently: they hand you a small, real alternative at the exact moment the urge hits, until the better choice becomes the default.
What you are actually replacing
Not the app. The reflex. The two-second gap where your thumb reaches for the feed on autopilot. Fill that gap with something that takes the same two seconds to start, a breath, a stretch, a message, and you have interrupted the loop at the only place it can be interrupted.