Intuit Keeps Adding to My Chart of Accounts

"They" aren't really changing your chart of accounts.

QuickBooks automatically adds 'special' accounts to your chart of accounts when you turn in specific features. For example, if you turn on payroll, several special payroll accounts are added.

Similarly, when the inventory feature is enabled, the special COGS and Inventory accounts used by default by inventory items are added.

It sounds like inventory is turned on but is not used, and so you are able to delete the special accounts. And also that QuickBooks checks as it opens the file to see if the accounts exist, and if not creates them again.

To stop this, turn off the inventory feature. Start at Edit | Preferences | Items & Inventory | Company Preferences and then de-select the Inventory and Purchase Orders are active setting to turn off inventory.