Hi,
Here is the details. At first I created a flow. Then I shared it with colleagues. After this I see the following picture. The flow in the section My flows is turned off:

Whereas, the flow in the section Team flow is turned on:

They both absolutely identical.
The flow looks the following:

As we can see, there are no any settings related to Notification action. So I assume that if you have if, it notify messages to you.
The main idea is to send notifications about techical events triggered by HTTP request on different services side. And I could subscribe colleagues to that notifications by sharing flow with them.