And then after two years, when you're no longer startup with 100usd bill, but bigger company, you're completly tied to a jungle of amazon products, and your exit strategy is very very costly.
clever amazon, clever.
Consider the evolution of container hosting services: first we had PaaSes like Heroku with proprietary container formats; then we got Docker, but Docker Swarm was nascent and there was no serious Docker Swarm IaaS-cloud offering. But then, very quickly, AWS built ECS; Google responded with Kubernetes; and then Kubernetes became the open standard, made everyone forget about Docker Swarm, and took over (and is even replacing ECS now.)
That's what happens when AWS enters a space. And it's great.
No lock in at all.
If you factor in the cost of not taking "the easy way" you'd likely never get past the 100usd phase.
You're point is valid. I'm just suggesting the lens / context isn't as one-sided as you've presented.
Put another way, plenty of startups and VCs would love to have "getting out from under AWS" at the top of their good problems to have list.