When your performance data lives only inside someone else's platform, you're optimizing blind. You see what they choose to show you, in the format they choose.
Owning your data means you can ask your own questions: which audience has the best lifetime value, not just the cheapest click? Which message drives repeat purchases, not just first ones?
First-party data — collected with consent, stored where you control it — is also more durable as third-party tracking continues to disappear. Build the habit now and you won't be scrambling later.