Similar alternatives exist - see Mapillary [1] (owned by Meta now, but they support OpenStreetMap and allow usage for that [2]) or KartaView [3] (owned by Grab).

I'm not aware of an OSM/open place to store/contribute pointclouds though - please let me know if you come across one!

[1]: https://mapillary.com

[2]: https://www.mapillary.com/osm

[3]: https://kartaview.org/