I have picked a many of these bikes from the trash
I combine the parts to make a couple of good bikes.
This is how I learned to repair bicycles. I didn;t want to start on high end bikes. evertything was free and if I broke something it didn't matter.
I have a old steel frame Biscayne Blazer I bought for $7 and I ride it for comutting and it's all from Xmart free parts even tires and tubes..