Genuine Guide said "Why bother putting tombstone pictures of strangers on a public website if you aren't going to share them?"
Oh, but anything you see on the internt IS being shared. On the web-site of the photographer's (aka copyright owner's) choosing. Feel free to create a text link TO that site.
Genuine Guide said "It would take more than one lifetime to search the entire internet and find a picture one believed was the picture one took while standing in front of a tombstone. Then, there's the tedious, legal process to wade through in order to have it removed from one website, then another and so on."
Actually, it doesn't take very much time for either the searching or submitting a DMCA take-down notice.
GenuineGuide said "When a relative sees a picture of their loved ones tombstone, most will save and copy and share it with other family members."
Saving to your own computer and keeping it for your own records is probably fine under the "Fair Use" copyright exemption. If the "sharing" with other family members involves publishing (i.e. posting) on a web-site, that is blatant infringement UNLESS the photographer has granted permission. And why shouldn't the relative or family researcher take the time to ask? The worst possible thing that could happen was the photographer says "No". Unfortunately, too many relatives and family researchers have not yet learned to ask or to accept that answer.
GenuineGuide said "I left because memorials that I worked hard to create, were snatched from me and given to a friend of an admin."
Were the memorials you created duplicates? How do you know the other person was "a friend of an admin"? There is probably another side to this story.
GenuineGuide said "At findagrave, it's not about our loved ones or finding ancestors and distant cousins. It's about the money."
Since Find A Grave is NOT a genealogy site, of course it is not about "finding ancestors and distant cousins". Considering it is a free site (unlike the site we are on now), it's hard to understand how it is "about the money".