Apparently BYD has been provided subsidies of at least 3.7 Billion from the CCP (Source) for years and they have a huge supplementary market in battery manufacturers (ie, CATL). The CCP support for EVs and green energy started in 2011 whereas honestly, I think the supporting industries have really only been supported in the US since the IRA (I know Tesla has been receiving subsidies since 2015).
So that's what I meant by a massive head start.
Wait...
They will have an economy rolling off the assembly line (not scaled production) by the end of 2025.
By 'economy' do you mean a $25Kish vehicle? I thought that was scrapped? Or are you talking about the Cybercab?
I was under the impression that Tesla vehicles usually took 4 years to go from announcement to production, with the CyberTruck understandably taking 5 years.