Wow, it must have been pretty intense feelings seeing Microsoft reveal exactly the same thing that you've been working on for months. Would you like to share what you experienced and how you coped with it?
Honestly, I don't even know if it's a coincidence or done on purpose. Initially, I'm just a simple developer who shared my bugs on Reddit and other platforms to find solutions to my problems. When I saw that Microsoft had the same functionality and the same name, my first thought was that there was no point in continuing this project because I would never be able to compete with them. Originally, I wanted to launch on June 27th, and I talked about this situation on Reddit. That's when I received a lot of feedback, which really warmed my heart. So, I decided to open-source my project, create a landing page in two days, and now I'm gradually building the project and making it publicly available for everyone.
There shouldn't be much coping considering that Rewind has been a thing for a long time and is already a giant.
I also work on a similar app (AI-less, though) and my initial though was, nice, more eyes on this sort of apps, I might get some additional sales as a result.