Synonym is technically majority-owned by Tether. Excluding US citizens is a strategic choice because of the experience of US Bitfinex team being used as jurisdictional leverage in the past, I believe. Still hope to work with you someday!

BitcoinErrorLog

BTC jobs - "USA citizens and USA residents are not eligible for this position" 

Signal312

Around the time I started SN, @BitcoinErrorLog and I discussed me joining synonym but they couldn't hire US residents.

I forget exactly what the reasoning was but it had something to do with @Synonym_to being owned by [Bitfinex](https://en.wikipedia.org/wiki/Bitfinex) which avoids formal relationships with US businesses and persons afaict.