[MikeDubreuil]

After watching the match I don't think any rules were broken.

RyanMcE, 93 has made an excellent offensive robot. The only way to stop them from scoring many points is to deffensively shut them down. 469's method was to stop balls from falling into their net. Unofortunately, at the same time there became entangled in your net material.
The argument could be made that the net material was a bad choice because 93 should have known teams would attempt to block their mechanism. Then they could potentially become lodged in something with a high probablibily of getting caught up in (netting).

It's unfortunate, but a lot of the best offensive teams get shut down by agressive defense. If you want to see an example check out almost any of team #47s matches. The first minute usually involves teams attempting to push them around.