Using funds collected for business operations shows commitment to investors and rewards their tokens at a fairer price. This is one of the benefits of token burn, at least investors and holders get greater transparency that the project holder does not pursue profit alone.
After giving a lot of airdrops now they burn the half, this is like a buy back program without spending money. This is what I like, they always innovate and surprise their fans. But it seems that this news does not really affect to the price of XLM in the market, because even the supply has decreases, but if demand does not increase it does not mean anything. So I think, to increase the demand, they should not only burn the half, but also have to add use value to XLM itself.
It is quite innovative. There are too many negative rumors about this, reportedly because there is no good news then they only plan to make it.