The Graph uses bonding curves to incentivize curators in an economic game to identify high-quality subgraphs. To signal on a subgraph, Curators deposit GRT into the subgraph’s bonding curve. In doing so, Curators mint curation shares of the subgraph, which entitle Curators to a portion of the subgraph’s query fees.
Using a bonding curve to mint and burn curation shares has the consequence that the value of the shares will increase proportionally when the supply of shares increases through minting. This is the case when other curators mint new curation shares of the subgraph as they start signaling on it. In this scenario, the value of your shares increases, which means that you would receive more GRT back than you initially deposited when you unsignal.
The opposite is the case when curators unsignal from the subgraph you are signaling on by burning their curation shares. If this happens after you have minted your shares, your shares will reduce in value. If you were to burn your curation shares, you could potentially receive less GRT than you initially deposited.