You're not going to hire a team in Eastern Europe for the same reasons why, in our current time, most companies don't use that method of hiring: time zone diffe

You're not going to hire a team in Eastern Europe for the same reasons why, in our current time, most companies don't use that method of hiring: time zone differences, language/culture differences and size of qualified talent pool. American developer salaries are so high not just because they're located in high COL areas, it's because most of the high performing developer talent is in the US. This isn't saying there isn't talent in Europe but per capita, the US has the lion share of the talent.