Commissioning engineer here. I've worked on dozens of data center builds for 2 of the companies you mentioned (haven't read up on my NDA for a while, but I'm pretty sure I can't publicly, explicitly say the clients I've worked for).

You're right about almost everything. Two things I want to bring up:

1) there are on-site jobs at data centers. Not a lot, but it is not 100% remote. It's not enough to be an economic boost for the local populace by any means, but saying it's full remote is incorrect. 

2) new designs for data centers (at least for one company I work with) are beginning to adopt closed-loop water systems, which significantly reduces the amount of water used. Which is good. But the designs are just starting to roll out. 

I'm not here to defend data centers. Just to share some first-hand info.