So, sanctions like these started in 2015 [0]. That was when the Chinese first topped the global super computer league (and that's for public super computers so presumably they'd been leading in private for a while?).
The US banned exports to 4 Chinese companies that made the machines.
So other companies spring up to fill the gap. This is problem 1: it takes very little time to setup a company, so sanctioning one is sort of pointless. You sanction PLA_Supplier1 LLC? Good thing PLA_Supplier1 LLC is interested in ordering the same kit!
The result was a roughly yearly round of sanctions. Every year's new list of names is a list of the companies that bypassed the last year's sanctions...
There is also problem 2: back in 2015 the computers used Intel parts but increasingly the Chinese are designing their own. They're not there yet, but they're making progress. TSMC still do most of the manufacture.
So the question is: how long till Chinese hackers steal the latest designs or Chinese engineers reverse engineer the parts they buy on the grey market? AND how long until China sets up a TSMC competitor?
I'm something of a hawk on China. I'm out on a ledge but here I am. I'd like to see real action on them for a long list of reasons. But before we can have real action, we need to drop the pretend action. Trump (what a turd) loved pretend action. Maybe Biden will be different? But this isn't that imho.
Source on the original tariffs:
[0] https://www.economist.com/business/2019/06/29/an-american-ba...