Founders get this wrong constantly.

Pinterest looks cool.
Reddit is trending.
Apple Ads feels shiny.
So they throw their media manager at it.

The reality is this:

You rarely add a new platform because Meta or Google no longer work.
That only applies to brands spending at massive scale.

Most teams add a new platform because the economics shift.

When CPMs on Meta and Google climb, when you move into full-funnel acquisition, when the cheap wins at the bottom of the funnel dry up, that is when it makes sense to look at Pinterest, Reddit, CTV, or DOOH.

Here is the real process:

1. Watch your upper and mid-funnel CPMs. If those rise, your reach is getting expensive.

2. Look for places where attention costs less. Platforms like Pinterest and Reddit often give you cheaper reach.

3. Build reach at a lower cost. Then retarget on Meta and Google where conversion performance is strongest.

4. Prove it with real measurement.
Post-purchase surveys.
UTM-controlled pages.
Brand lift tests.
Deduped revenue inside Triple Whale or Northbeam.
Incrementality experiments.

5. Scale once the loop closes and the numbers hold.

That is how you add a platform without burning budget.

Skip this process and you are buying lessons the hard way.