It’s really obvious. The image tag is a standard tag and simple to use. Mapillary is a commercial company with a proprietary API and can be shut down or change its API at any time. (In fact it changed all its identifiers in the past and that required al lot of work on OSM side.) It belongs to a company that is well known for data collection of its users.

The Internet Archive an its Wayback Machine are non commercial. And you can still view the images that I archived a few years ago and will hopefully be able to view it in the future when Mapillary might be shut down or changed its API again, without data collection.