QB Issue Resolution:

Yup you’re correct but QBDataServiceUserxx is a service. 🙂 You can delete those directories as long as you have QBDataServiceUser23 automatically running and listed under Services window. 🙂

Resolution for Issue 'My PC has dozens and dozens of QBDataServiceUser23.computer_name.000, .001, .002, etc. directories in addition to one that’s just QBDataServiceUser23.' available: Yes (Solved).
Source: Intuit Community forum.

My PC has dozens and dozens of QBDataServiceUser23.computer_name.000, .001, .002, etc. directories in addition to one that’s just QBDataServiceUser23.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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