Logo settings are stored in the DWORD DisplayLogo value of the Software\Microsoft\Windows Script Host\Settings under HKEY_LOCAL_MACHINE and HKEY_CURRENT_USER ( HKEY_USERS\<SID> , in fact).
To change the default setting for all users, set the value in HKEY_LOCAL_MACHINE to 0x0 :
reg add "HKLM\Software\Microsoft\Windows Script Host\Settings" /v DisplayLogo /t REG_DWORD /d 0x0 /f
To change the setting for the current user, set the value in HKEY_CURRENT_USER to 0x0 :
reg add "HKCU\Software\Microsoft\Windows Script Host\Settings" /v DisplayLogo /t REG_DWORD /d 0x0 /f
If you want to change the settings for other users, you will have to first upload their user bush to the registry.
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