Does the square footage take into account multiple floors? What's the source? It can be misleading, because you don't know the compute density of what's inside. Using just public data, power is a more accurate proxy. Until at least 5-6 years ago, Google was procuring more electricity than Amazon. Before that, it had a further advantage from lower PUE, but I bet the big names are all comparable on that front by now. Anyone that has worked at several of them can infer that FB is not the largest (but it's still huge).
As for the dollars, were they just in 2019 or cumulative? The Google ones seem low compared to numbers from earnings.
Google certainly has more compute density than Amazon, the numbers I was able to find from the local power company was 250MW at Council Bluffs back in 2015 or so.
Amazon builds out 32MW shells, and the most utilized as of 5 or 6 years ago was 24MW or so, with most being much less than that.
As for the dollars, were they just in 2019 or cumulative? The Google ones seem low compared to numbers from earnings.