For example, the recent patent granted to Samsung, to use an emoji-like representation of your face.
https://www.androidauthority.com/samsung-ar-emoji-video-call...
I had the exact same idea for this, but I thought it was just a cute little feature. I didn't think to patent this. And I'm sure thousands of other people had the same idea too.
But since Samsung was the first to patent it, now, if you make a little program that uses this same idea too, then you are liable for patent infringement. And you will be sued by Samsung.
Patents were originally devised as a means to protect the small players, from being dominated by the larger and richer players. In the 1700s to 1900s, the American patent system may have had the original idea to protect their small inventors, against the richer inventors in Europe. This was to help give them a fighting chance.
But today, with all the patents being filed by the large and dominant Fortune 500 companies, the purpose of the patent protections to help the smaller players, are now largely irrelevant.
Nowadays, the purpose of patents is for nationalism, to protect against other countries.
The other egregious patent that was granted, was the Swipe Left and Swipe Right, that was granted to Tinder.