It should be noted that this is advice specific to white men in Western countries 😆 but yes, it’s true.

China based. I wouldn’t put anything private or sensitive on their servers…

This right here. We are undoubtedly the plastic generation. And it’s not letting up any time soon; our kids will be included in this cohort as well. Banning plastic bags in cities is next to useless when everything we eat, everything we drink, and everything we buy is wrapped in plastic.

You’ve covered most of the common types, or the types of bed material that are purposely designed for printing:

https://all3dp.com/2/3d-printer-bed-how-to-choose-the-right-build-plate/ https://www.matterhackers.com/news/choosing-the-right-3d-print-bed-surface

But you’re right, the sky really is the limit here. You can print on just about anything, especially if you’re printing with a material that doesn’t strictly require a heated bed (like PLA). If you need a heated bed, then the material needs to be at least a bit thermally conductive.