'Why the method uses Activator.CreateInstance instead of directly "new Class()"?

In the method GetNotificationCorrespondingToDomainEvent in https://github.com/jasontaylordev/CleanArchitecture/blob/main/src/Infrastructure/Services/DomainEventService.cs, it has the following method,

private INotification GetNotificationCorrespondingToDomainEvent(DomainEvent domainEvent)
{
    return (INotification)Activator.CreateInstance(
        typeof(DomainEventNotification<>).MakeGenericType(domainEvent.GetType()), domainEvent)!;
}

How it compares with new DomainEventNotification(....)? BTW, is the ! at the end necessary?

private INotification GetNotificationCorrespondingToDomainEvent(DomainEvent domainEvent)
{
    return new DomainEventNotification<DomainEvent>(domainEvent)!;
}
c++sharp


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