Why not?

Someday people might look at your project and become demotivated at their own, and the cycle continues

It’s always true because the ratio of miles to km is really close to the golden ratio.

If you do it for a zillion miles you’ll be off by a lot of km, but proportionally the same amount as for 1 mile

What makes you think the streaming service ecosystem will collapse?

I would consider using PLA for single-use (like a popsicle mold or something) but because of the bacteria concern others have mentioned, it definitely isn’t recommended beyond that.

Doing 400mm tall prints on a bedslinger would sketch me out