I find it hard to believe that the businesses selling the highest profit margin products and posting the highest profits received stimulus funds.
A likelier explanation for how big tech got big is that they delivered something of very high utility to people around the world and it has low marginal costs and high barriers to entry for competitors.
An example of gov intervention: banning Huawei as it was rising as a global phone maker, international tarriff negociation (the whole stupid tarriff war happened as China was rising as high end device exporter), protecting Apple's business when challenged on anti-trust grounds (Apple's open stance to the judge was "we need extortion to make money, let us keep brinig money in"). In doubt, look back at these photos of Tim Cook cringing next to Trump because he can't just say no.
They might be right, but it's super hard to determine where good intentions stop and self interest starts.
The UK had set up a different approach where Huawei exposed their entire stack to UK security authority scrutiny.
The "Five Eyes" security alliance (US/CA/UK/AU/NZ) basically then decided that they didn't want Huawei "inside" the 5G network, partially because of oversold promises of what 5G would enable.
There is a new "cold war" between the US (and the "West") and China and a realignment of alliances since the 2nd term of Xi began and he started rolling back the opening up of China's economy.
This has accelerated after the crack down in Hong Kong and the sabre rattling about Taiwan.
(Original source: https://www.nytimes.com/2019/03/17/us/politics/huawei-ban.ht...)
And yet, I don't say these companies are anything else than they are
There are many forms of sovereign ownership and influence in them, who cares
It's beyond the understanding of your or I, and probably anyone. The relationship between these stakeholders is too complex to accurately dissect, but their actions speak louder than press releases.