[troyvit]

From an economics standpoint, does that make tech giants good, or does it make the US's GDP weaker since so much wealth is concentrated among so few players?

I keep wanting to push back on whether GDP is the best way to measure an economy, but most of the articles I find bring in concepts like "[GDP] doesn’t meaningfully account for successful management of priorities like public health, economic equity, climate action, or racial justice."[1] But you're making it clear you're talking from a purely economics standpoint. So pushing back on the ethics of applying GDP doesn't even apply.

[1] https://hbr.org/2021/02/a-better-way-to-measure-gdp