Earlier quoted context omitted.
Prerender as I can see is founded by Hungarian and most employees are Hungarian. Even if he hired 2 FTEs in Hungary to maintain (which I doubt), it would eat 200k at most (probably much less), so they still saved 600k. For 800k he could probably hire 10 more people, to improve development, sales, marketing, support, and that would be better investment instead of burning money on AWS.
I’m from Hungary, and I have to tell you, you are WAY off with those salaries. As a senior software engineer, you can make maybe $35k a year, before taxes, if you are good. You can make it $50k if you are very good. 2 years ago I was making $23k (yearly, before taxes), before I moved to Canada and started working at Amazon for $170k usd. Europe, especially the eastern parts of europe has an extremely cheap workforce.
You can make that amount normally in Eastern Europe when working on local market, you do not need to be good, average is enough. If you are good then you can make 60k+ USD. And if you are really good you can make easily 100k+ USD working for US based company remotely.