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1) A few of the things I randomly clicked on there don't seem to have obvious hardware source links.

2) Disappointing the software itself isn't open source.

Seems like this one [0] is ripping off the Pololu brand [1]. How do you prevent this? I didn't see any way to report a listing.

[0] https://lectronz.com/products/drv8825-stepper-motor-stepstic...

[1] https://pololu.com

The listing says it's compatible with Pololu pinout. That has become a common term in stepper motor control.

It's little more than a standard IC on a simple board with a standard pinout.

How are half these things open hardware? Most of the items list can be found, and probably are, on a no-name aliexpress page.

I mean, in what world is a terminal block "open hardware" https://lectronz.com/products/-3-5mm-pluggable-terminal-bloc...

I mean, if they included drawings sufficient to recreate it, maybe a cad model for the plastic injection molds? But as it stands, I wouldn't call it especially open source.
There should be more good sites like this.