Elsevier and nature charge $5000 for full open access, and not even in their top journals. Cell reports and scientific reports have high impact factor but are considered second-tier compared to Cell and Nature (The editors of the latter will redirect you to pay to submit to those open access journals if rejected)

https://www.cell.com/rights-sharing-embargoes

And this is all paid with taxpayer money. Good thing that taxpayers don't know about this situation or we d have riots