Paid growth involves spending money to acquire users. It's important to ensure that the lifetime value of a customer exceeds the cost of acquiring them, or else the growth strategy may not be sustainable.

The customer acquisition cost (CAC) must be lower than the revenue generated from a user to ensure sustainable growth.

Relying solely on paid acquisition for growth is risky. If your growth depends only on ads, it may not be sustainable in the long run, especially as competition increases.

Be cautious with paid growth, as it can be risky; if you pay for users who don't generate enough revenue, you could run out of money.

When measuring customer acquisition cost (CAC), focus on active, monetized users rather than just sign-ups, as many may drop off shortly after registration. This ensures you're tracking the cost of retaining valuable users.

If your product is valuable and users have a high lifetime value, then investing in paid acquisition channels like Google and Facebook can be beneficial.

It's a common mistake to assume that paid acquisition costs will remain constant; in reality, it often becomes more expensive to find and convert users over time.

For pricing experiments, it's crucial to understand whether you're growing virally or need to fund growth through paid marketing, as this affects your pricing strategy.

As a startup grows, the focus shifts from just acquiring users to ensuring sustainable growth and revenue. We learned the hard way that even if users love our product, we must also pay attention to our overall growth metrics to avoid becoming a beloved startup that fails due to lack of financial viability.