The MapleTreasury contracts is how the Maple protocol collects and manages revenues.
Revenues collected by the MapleTreasury will be used to fund further development of the protocol, but can also be distributed to the MPL token holders via xMPL.
The governor which is read from MapleGlobals has admin rights interact with the MapleTreasury including pulling funds using reclaimERC20.
Fees generated by the protocol are paid to the MapleTreasury. A more detailed breakdown can be found in the fees section of the wiki.