In many community platforms, it is possible to paste in an image.
This greatly reduces friction as it takes 1-second to add any image by copying & pasting.
Example: I was writing a comment and I wanted to add an image as an explanation. I tried to paste in the image via CTRL+V shortcut.
When it didn't allow me to do that, I got lazy and almost decided not to upload the image --> because I would first have to Save As to my local drive and then upload it into forem. That is an added 10 seconds of work that many users might be too lazy to do. Over 1 million user hours, I am sure it starts making a significant difference in engagement / posting images.