Not sure I understand, I don't think there is any way the FB algo witll act different based on what rules you put in place...
Posting links to products is entirely OK in the group where I am an admin, however recently a participant started posting Amazon links like there was no tomorrow... went on for perhaps a couple of weeks (yes, I should have stopped him immediately...)
I share that feeling, and I think it has perhaps gotten worse recently - a likely explanation could be that FB is in a pinch when it comes to advertising revenues - so they are less happy about their platform being used for others advertising, so when there are product links they make the posts less visible...
Okay, probably due to the spamming and not necessarily due to the links. I think a bunch of users might have tuned the page out because of the spam and this is what hit growth/ reach.
Yep, good point, FB probably detected that signal. One effect that I have also observed is that when the same person posts repeatedly, the individual posts get less views, I think this is algorithmically determined.
Putting the link in a comment seems like a plausible work-around, I thought about that too, no idea if it works (i.e. does not crash visibility), though.
