> For example, because of his bullshit aws certificates, this person will have the feeling of being part of a special club, and a sunk cost incentive to push for whatever possible aws solution to any problem instead of anything else.

I haven't met very many, but this is basically the attiude I've got from most people with AWS training.

Edit: With good/experienced developers, it's usually not that bad, but with new developers it can easily turn them into architecture astronauts.