Instagram has original content as well. You wouldn't believe how little are most pornstars paid (would you let yourself be filmed with an unknown man for $250-$1000?) unless they are superstars so they need to reach out elsewhere, using their filmed scenes as "marketing", trying to catch some rich sugar daddies or clients on Instagram. That all evaporates once their bodies can't compete with younger "models", cycle repeating itself. It's best for Instagram to pull the plug on their part of the cycle.