Well, you may want to start reading what others write before shooting back. As a matter of fact, you charge money for a license that does what other plugins do for free – period. That’s two stars off in my book. You may manage to squeeze out some bytes here and there but no one really needs those saved, not at that price tag anyway.
Also, your ‘free plan’ is pretty much unusable for anyone here and you know that very well. You guys seem to forget this is WordPress and what that means and stands for. That’s another star off from me.
By the way, those free alternatives use lossless compression to optimize images (obviously including thumbnails) too so there you go. You know, you’re probably gonna have to find a way to live with the fact that someone just doesn’t buy your [expletive removed] ??
Have a great day though and good luck.