Myself, I would just redonate it to your favorite thrift store. I have done that a few times. Doesn't sound like any decent parts on that bike. Well, I guess you could salvage the fenders.
I have bought POS bikes solely for the seat, grips, that kind of stuff. And occasionally, I make a mistake. Rather than mess around with a mistake, I just donate it off and move on.
Often, I will pick up a crapper as part of a package deal (seller wants someone to take all of their bikes, one price, one deal). I have taken some of that crap right to the thrift store on the way home. No reason to even bring it home and unload it.
But I have a handful of mistakes right now. Some are not even worthy of donating. I curbed a couple of them.