If BKN had its own picks, everyone would be going bananas about their tank. It's a nice counterpoint to the argument about how the lottery distorts incentives in any substantive manner.
My view is that the influence of tanking on player effort is zero (as noted above). But further, that its influence on roster composition is much less than some people presume. The bottom line is that good players are hard to get, and if you have bad players it takes time, effort and luck to replace them with better players. So a lot of what gets labeled "tanking" is bad basketball by teams who'd like to be better, but can't be.
I mean, look at Philly. They pretty clearly have moved from the "tank" phase to the "develop and win" phase, and they still pretty much suck. Their stable of coveted lottery draftees has yielded exactly zero above-replacement players as of right now. Embiid was their best hope and he's been good...for 31 out of 210 games so far. Noel and Okafor are worth pennies on the dollar relative to their draft position. Simmons hasn't played a game. Etc.
Even Minny has gotten good production on paper out of their lottery picks, and all it's done is push them into the 5-7 range. Are they tanking? Wouldn't they rather be better than they are right now?