Spreadsheet software also does not work properly due to computer hacking

Since 2013, the domain investor has realized that using spreadsheets is a waste of time for her, due to extensive computer hacking
The spreadsheets are hacked so much, that summation of figures is not accurate
Software users expect the software to work perfectly especially for basic math like addition and substraction
When software does not work for basic addition, it is better to shut down the computer and work offline.