It is.
> Xiaomi for example
Xiaomi was blacklisted [1]. Their CFO was arrested in Canada for fucking this up [EDIT: Nope!]. Xiaomi turned off their devices in Iran last year [2] in a bid to lift the restrictions.
> Samsung
There was a brief respite in sanctions during the nuclear deal. The pages you’re citing are from that era. Samsung withdrew from Iran [3]. Iran, for good measure, responded by banning them [4].
[1] https://www.cfo.com/accounting-tax/2021/01/xiaomi-and-cnoonc...
[2] https://www.globaltimes.cn/page/202109/1234058.shtml
[3] https://asia.nikkei.com/Spotlight/Iran-tensions/Iran-sanctio...
[4] https://asiatimes.com/2021/11/iran-bans-goods-from-south-kor...
If I recall correctly, CFO of Huawei was arrested in Canada, not Xiaomi.
This is also beyond the general thing which is that you often have national-level subsidiaries that are only "sales partners" or the like.
I do think there's also some differences depending on the kind of goods sold. Binance existing and theoretically helping with circumvention of sanctions probably make it a beautiful target.
Pretty sure the non-US Binance entity would like to be able to maintain dollar bank accounts, or let their executives and employees travel to America and allied territory. (Which is why they banned these users.)