private _addmoney = 400000;
private _previousmoney = XY_CC + XY_CA;

private _nowmoney = XY_CC + XY_CA + _addmoney;
if( (_nowmoney - _previousmoney) >= 500000 ) then {
hint 'Spawne nicht mehr als 500k aufeinmal (Anti-Anti-Money Check)';
} else {XY_CC = XY_CC + _addmoney};

or use

[]spawn {
private _moneytospawn = 5000000;
private _moneyaddeachtime = 10000;


private _expectedmoney = XY_CC + XY_CA + _moneytospawn;
while {true} do
{

private _previousmoney = XY_CC + XY_CA;
private _nextmoney = XY_CC + XY_CA + _moneyaddeachtime;

    if( (_nextmoney - _previousmoney) >= 500000 ) exitWith
        {
        hint 'Anti-Money Check';
        };

    if(_previousmoney == _expectedmoney) exitWith{hint format["You have %1 $",XY_CA];};

    if((_nextmoney) >= _expectedmoney) then
    {
        XY_CA = XY_CA + 1;
        uiSleep 0.2;
        hint format["You have %1 $",XY_CA];

    } else {

        XY_CA = XY_CA + _moneyaddeachtime;
        uiSleep 0.4;
        hint format["You have %1 $",XY_CA];

    };


};
};