It's different from burning in two ways, as far as I understand it so far:

• the PCV liquidity generates yields which are reinvested and keeps growing PCV, while burned tokens are excluded from circulation (something relatively similar to what will happen on the SPK Network, I believe, with the locked Hive from their token sales)
• this protocol owned liquidity is pooled and participates in the overall liquidity - deepening it - so it facilitates larger swaps between tokens without significant slippages, especially where POLYCUB is one of the tokens in the pool, like in POLYCUB-USDC and POLYCUB-WETH.

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