Because you perceive public clouds only as virtual machine providers, that you can replace with other provider in two days. A detailed cloud migration consists of replacing some parts of your software to use managed services provided by a specific cloud provider, and AWS is still has the best service offerings IMHO. When you use these services carefully also you will see that AWS is very cheap and reliable enough. Outages like today's are happening in every platform and it is possible to mitigate them.

You can use Adwords as a self-service user. Without knowing so much of details you can run your ads but also you can bery easily ruin your budget. But many enterprise customers use it very differently than those users and they are extremely optimizing the cost. Cloud is the same. If you don't know how big customers use AWS, it is normal that you are surprised because AWS is still leading the market.

You say GCP is better than AWS. Which part is better? GCP does not have many services of AWS we benefit from. How can you compare totally different providers? You can only say AWS EC2 is worse than GCP. But you cannot compare whole platforms in one sentence.