I think what made bikes like this so bad (unsafe) were the brakes. the type that anyone other than the store owner where I worked would turn away.
Repair took 3x the time for half the benefit.
Rebuild the wheels, often so bad that only 2/3rds of the wheel's spokes were in tension… buy a complete set of brakes and at least it would run.
I could go on with what was typically wrong but the bottom line from everyone here is not this bike.