> In contrast, Ashburn, Dallas, and LA seem to lack ASN diversity, primarily being dominated by singular big tech companies

I don't think you understand the scale of the "Ashburn Metro Area." It is upwards of 250 buildings (maybe 50 of which are "big tech companies") compared to the 70 or so in Amsterdam.

Are you familiar with what ASNs actually are? That is like saying Delaware is the biggest US state by land mass because every large company is incorporated there.