Why the Cloud Can Substantially Endanger Your Startup (Up to 1000x More Expensive) – Paul Müller, Ex-CTO & Co-Founder Adjust

About this episode

The cloud is now the standard everywhere – but this can cost startups dearly. Paul Müller, co-founder and ex-CTO of Adjust (sold for 1 billion euros), warns about the hidden cost traps of cloud infrastructure and shows when alternatives make more sense.

The Cloud Reality: Standard, But Not Always Smart

Cloud computing has established itself as the de facto standard. The advantages are obvious: rapid scaling, no hardware investments, pay-as-you-use models. But Paul Müller brings a different perspective: "What does this actually cost?" and "We can optimize that later" – he hears these two sentences far too often from founders.

At Adjust, a mobile marketing analytics company, Müller learned the hard realities of cloud costs firsthand. The experiences show: what initially appears as a flexible, cost-effective solution can quickly become a financial nightmare.

The Bandwidth Problem: Why Neither Founders Nor VCs Understand the True Costs

A major problem lies in the bandwidth business. Gigabit and volume – two terms that many founders underestimate. Cloud providers charge not only for computing power and storage, but also for data transfer. For data-intensive business models, these costs can explode.

"Serverless" is often sold as the best solution, but reality looks different. Hosted services can become hell when costs spiral out of control. Müller warns of "buried bodies" – decisions that initially seem harmless but can later become existentially threatening.

Hardware vs. Cloud: When Your Own Infrastructure Is Faster

A surprising insight: hardware can be faster than the cloud. While cloud services offer flexibility, they also bring latency and additional abstraction layers. For performance-critical applications, dedicated hardware can be the better choice.

The question isn't whether cloud is good or bad, but: for which business models does it make sense?

When Cloud Makes Sense – And When It Doesn't

Cloud is particularly suitable for:

• –Startups in the early prototyping phase
• –Companies with unpredictable load spikes
• –Teams without dedicated infrastructure expertise
• –Business models with low data volume

It becomes problematic with:

• –Data-intensive applications with high throughput
• –Consistently high load without major fluctuations
• –Cost-optimized business models
• –Startups that want to "optimize later"

Prototyping in the Cloud: Okay, But With an Exit Strategy

For the prototyping phase, cloud can certainly make sense. The quick start and simple implementation initially outweigh the cost disadvantages. However, it's important to develop an exit strategy early. Those who plan from the beginning how they can optimize their infrastructure later avoid nasty surprises.

Infrastructure Planning: Finding the Right Conversation Partners

Müller emphasizes the importance of speaking with the right experts early on. Not every developer is also an infrastructure specialist. When planning infrastructure, founders should specifically ask about experiences with similar business models and scaling challenges.

Solving Problems Before They Become Critical

The most important lesson: infrastructure problems don't solve themselves. "We'll optimize that later" is a dangerous approach. Instead, founders should:

• –Regularly analyze their cloud costs
• –Evaluate alternatives early
• –Speak with experts who have solved similar scaling problems
• –Develop a long-term infrastructure strategy

Conclusion: Use Cloud Smartly, Don't Trust Blindly

Cloud isn't inherently bad – but it's also not the solution for everything. Paul Müller's experiences at Adjust show: those who don't understand the true costs and don't plan alternative scenarios can bring their startup into existential difficulties. The cloud should be a consciously chosen tool, not the default path without alternatives.

For founders, this means: cloud yes, but with open eyes and a clear understanding of cost structures. Only this way can you harness the potential without falling into the cost trap.