As far as being a stake pool operator (SPO), is it possible for one stake pool to handle mainnet and also sidechains simultaneously? For additional detail: I see a lot of SPOs having more than one stake pool, e.g.: POOL, POOL2, POOL3, etc. My question focuses on one stake pool, so let's say POOL2. Can POOL2 handle transactions from mainnet and 1-N sidechains, at least theoretically? This is an important question because it offers more incentivization in terms of yield for an SPO.