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Amazon has been trying to move off Oracle for 5 years and it’s still expected to take two more.

https://www.cnbc.com/2018/08/01/amazon-plans-to-move-off-ora...

Moving off of an infrastructure is hard.....

It is and vendors certainly don't make it easy to do. Most migration tools are written by the competition and are usually lackluster at best.

As I mentioned, the App Store and the iTunes Store are still on WebObjects. It’s not because of vendor lock in, its always hard to change infrastructure. If ain’t broke, don’t fix it. No company is going to change from AWS to Azure to temporarily save a little money and very few statistically are going to take thier infrastructure in house that were in AWS and buy a lot of colo equipment in multiple data centers and hire a bunch of people to maintain it if it’s not their core business.

Netflix is famous for transitioning from thier own infrastructure to AWS. If you look at thier open source tooling, there are a lot of AWS specific pieces.

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