[RivieraKid]

They've fixed it in the web, mobile will be fixed in the new release according to the linked comment. Maybe threaten to sue them if this is a priority for you.

[sm4rk0]

They did not fix it by putting only "© OpenStreetMap".

From https://www.openstreetmap.org/copyright/en

> How to credit OpenStreetMap

> We require that you use the credit “© OpenStreetMap contributors”.