Based on jurisdiction, most ICOs are actually based in Western Europe, from my observation, due to either lax or welcoming regulations regarding ICOs and crypto.
But based on actual people managing and running, definitely Russians or Eastern Europeans. Partially due to their capacities - a lot of these countries invested heavily in the IT and computer engineering sectors. So the expertise lies with them.
Funders/backers, I think partially Eastern Europe and a lot of East Asians. Hard to say, though as this info is seldom transparent.
Step back,
For about 100+ years Russian 's have led the world in MATH, maybe longer, for 50+ past years there was 100k kids per computer, they had nothing to do but do math and think, before they got keyboard time, thus they're better thinkers
Then there is the CHINESE they love to GAMBLE ( buying trading cryptos is just fucking gambling ),
The west say USA has NO money, the average american has NOT $500 USD in the bank, thus they are out,
The average chinese these days is rich, and wants to be RICHER,
Toss the salad above together and you get Russians producing solid code, and chinese buying the shit as quick as they can
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Also ASIA is nice cuz stuff is cheap everything is $1 USD, cpus are $3, most hw like connectors is $1, ... its just so easy in ASIA/CHINA to do hardware, in Russia its easy to do software, its natural, again I think because historically HW has always been expensive, people had to think first
USA is the most fucked, followed by western-europe, all these places are fucked.
Go to SIngapore or Hong-Kong today you will see vibrant cultures of wealth, and they're all 100% trading in crypto's for their long term investments, all 'Gold Like' in approach, keeping wealth is hard, earning is easy, keeping from GOV can almost be impossible, most ppl their biggest concern is moving their wealth in&out of GOV controlled area's, and CRYPTO is the ONLY solution. Everybody sees this
The good news is that GOV as we know may soon go the way of dinosaur, once the power of print fiat paper money becomes worthless, because nobody see's value ( greshams law ) worthless money is visible, good money cannot be found