I found a difference in LM community site and forum.
whenever we place any image on community tutorial site we need to mention url of the image. that means all images of the posted tutorial are store on 3rd party server. if any one account was deleted or suspended by the 3rd party then those tutorial will be effected that used effected account's images.
but on LM forum image upload option is available.
LM community site should provide image upload option. and store image on there own server.