Also, it isn't ingenious to win against a spinner by entangling it. It would be incredibly easy. You'd need to loosely attach some netting to your bot and just feed it to the spinner, which will lock it up, with the rest of the fight being a shoving match between a bot not meant for shoving and one most likely just a box. There's no cleverness there; it's not a fight. No skills are required.

It's equally biased to expect spinners to all redesign in order to be immune, which would be pretty much impossible anyway; nets and cables would remain insta-win methods.

Plus the safety points Gary makes.

All in all this is something that was revised in (or is it out) of the rules a long long time ago. Entanglement being banned is the better way.