Yes, the same thing happened to me. The email I got was this:
"Congratulations on reaching an important milestone in your Mapillary journey. You’ve passed the 100,000 image mark, which makes you one of the most significant contributors in the Mapillary community.
You’re helping create better maps all over the world because the data from each image is available to anyone through our platform. The whole mapping community is grateful for your contribution. If you’d like to discover more about how to use Mapillary data in OpenStreetMap, this blogpost might be interesting for you.
Your next adventure is reaching 500,000 images. When you reach your next milestone, we will send out Mapillary Swag to express our appreciation for your contributions to Mapillary.
We would also like to hear your feedback on using Mapillary, so please reply to this email if you have any thoughts to share. Thank you for joining us on this journey.
Said & the Mapillary team "
The link in the Blog post took me to https://shop.mapillary.com/product/1m-milestone-package/ and asked me for password, but it didn’t accept any of my passwords (the main mapillary.com site and this forum passwords).