Cmdlet to list resource groups and owners so you can track down who is using your Azure credit

Get-ResourceOwner.ps1

[CmdletBinding()]
param ([switch] $Recurse)

$users = @{}

function GetRoles {
    param($assignments, $RoleDefinitionName) 

    $roles = $assignments |
        Where-Object { $_.RoleDefinitionName -eq $RoleDefinitionName} | 
        Select-Object -ExpandProperty DisplayName -Unique

    $roles | ForEach-Object {
        if ($users.ContainsKey($_)) {
            return
        }

        $users[$_] = $_
        Write-Verbose "New user found: $_"
    }

    $roles
}

$resourceGroups = Get-AzResourceGroup
$totalGroups = $resourceGroups.Count
$i = 0.0

$resourceGroups | ForEach-Object {

    $progressArgs = @{
        Activity = "Extracting Roles"
        Status = $_.ResourceGroupName
        PercentComplete = $i++ * 100.0 / $totalGroups
    }

    Write-Progress @progressArgs

    $auth = $_ | Get-AzRoleAssignment | Where-Object { $_.ObjectType -eq 'User'}
    
    if ($Recurse) {
        $resources = Get-AzResource -ResourceGroupName $_.ResourceGroupName |
            ForEach-Object {

                Write-Progress @progressArgs -CurrentOperation $_.ResourceName

                $roleAssignmentArgs = @{
                    ResourceGroupName = $_.ResourceGroupName
                    ResourceName = $_.ResourceName
                    ResourceType = $_.ResourceType
                }

                $resourceAuth = Get-AzRoleAssignment @roleAssignmentArgs -ErrorAction Ignore | 
                    Where-Object { $_.ObjectType -eq 'User'}

                [pscustomobject] [ordered] @{
                    ResourceName = $_.ResourceName
                    ResourceType = $_.ResourceType
                    Owners = (GetRoles $resourceAuth 'Owner')
                    Contributors = (GetRoles $resourceAuth 'Contributor')
                }
            }
    }

    [pscustomobject] [ordered] @{
        ResourceGroupName = $_.ResourceGroupName
        Owners = (GetRoles $auth 'Owner')
        Contributors = (GetRoles $auth 'Contributor')
        Resources = $resources
    }

}

Write-Progress -Activity "Extracting Roles" -Completed