I have gotten scammed once, not from anyone from TBT or Nookazon, but from a random person on Instagram

There was a post someone made on an item and I made a reply saying if anyone has these items I would like to purchase them or trade for them. So someone contacted me saying they would like to do a catalog trade. I brought a bunch of items that was on their wishlist in exchange for me to be able to catalog their fortune cookie cart and get a crafted dog house. At the time I did not know the fortune cookie cart was a special item

so yeah, never got that! Nor did they bother to let me know and they didn't give me a crafted dog house either. The saddest part was, I also gave them 100k because I was thankful they were willing to craft the dog house ;-; so I never got the items, gave them free bells, and they got to catalog my items lol....
Oh, second time something similar happened (although I wouldn't really consider this a scam??) was when I made an offer for a Happy Birthday Cake on Nookazon. The seller handed me a Mom's Cake instead. Feeling confused, I asked them, is this really a birthday cake?? The person insisted it was...so I asked again phrasing it different saying, "Oh, mom's cake is the same as a birthday cake?" Again, they said yeah lol. So either the person really believed that or they were trying to trick me xD I would like to believe they really didn't know so this is my maybe I got scammed experience.
My only other bad experience with someone was when I had let someone on my island for a trade (again from Instagram). After we traded, they asked me if they could go shopping at my stores and I said yes. And during this trade, I did not have my fences up as I usually do for all trades on my island. And lolol, the one time I had no fences up, this happens

Instead of going to my shops, the person started runing around my island going who knows where and I have a bunch of items laying everywhere as I have no more storage room. Being alarmed at them doing the opposite of what they said, I immediately pressed the power button. After two bad expriences from traders on Instagram, I decided never again will I make a trade from there. Then I discovered this forum and now I feel better about trading, selling, and buying from people ^^ yay~~~