How silly...
This is clearly not cheating.
CHEAT
transitive verb
1: to deprive of something valuable by the use of deceit or fraud
2: to influence or lead by deceit, trick, or artifice
intransitive verb
1: to practice fraud or trickery
2: to violate rules dishonestly <cheat at cards> <cheating on a test>
There's no deceit, fraud, or rules violation; the strategy is 'out there' for all to discuss, critique, and copy.
Is the practice unethical? That's not quite as straightforward (although it's pretty close, in my opinion). In other sports we applaud the team that works together for a common goal. Is it wrong for a baseball team to come up with a unified approach against an opposing pitcher (lay off the curveball, wait for fastballs)? Baseball also has the sacrifice, where the hitter gives up his chance to get a hit for the betterment of the team. Should all hitters be required to hack away every time?
Was it unethical for the younger, less-experienced US Olympic hockey players in 1980 to "team" up on the superior Soviets? Perhaps each player should have just gone out and done their own thing, and let the chips fall where they may...?
My only question for Riggs is about minors. Is it appropriate for someone who is struggling in Singles to consider "helping" another who is scoring well? Either by getting off his line or trying to improve it?