Factory.sol

This contract deploys DAO

function create(
        string memory _daoName,
        string memory _daoSymbol,
        uint8 _quorum,
        address[] memory _partners,
        uint256[] memory _shares
    ) external returns (bool) {
        Dao dao = new Dao(_daoName, _daoSymbol, _quorum, _partners, _shares);

        subscriptions[address(dao)] = block.timestamp + freeTrial;

        require(daos.add(address(dao)));

        emit DaoCreated(address(dao));

        return true;
    }

Factory also controls subscription option

mapping(address => uint256) public subscriptions;

uint256 public monthlyCost;

uint256 public freeTrial;

If monthlyCost > 0, only dao with subscriptions[daoAddress] == true can execute voting

Anyone can buy subscription for any DAO. Pay with XDAO tokens

function subscribe(address _dao) external returns (bool) {
        require(daos.contains(_dao));

        IERC20(xdao).safeTransferFrom(msg.sender, owner(), monthlyCost);

        if (subscriptions[_dao] == 0 || subscriptions[_dao] < block.timestamp) {
            subscriptions[_dao] = block.timestamp + 30 days;
        } else {
            subscriptions[_dao] += 30 days;
        }

        return true;
    }