People use what’s the default. It’s that simple. Any knowledge of how images are encoded is kind of unnecessary information for most folks.
There are a ton of technical and usage-based arguments around image formats, and political complications, but ultimately jpeg’s eternal dominance comes down to people using their app defaults, and wanting stuff to just work. And PNGs are big enough to create technical issues or incompatibilities, sometimes.
The real answer is because it’s default.
People use what’s the default. It’s that simple. Any knowledge of how images are encoded is kind of unnecessary information for most folks.
There are a ton of technical and usage-based arguments around image formats, and political complications, but ultimately jpeg’s eternal dominance comes down to people using their app defaults, and wanting stuff to just work. And PNGs are big enough to create technical issues or incompatibilities, sometimes.