Agreed. While it's perfectly within a developer's rights to abandon a project without notice, the fact that money is spent on these things makes it worse for me. Remember Captcha Be Gone? Remember how that was a subscription service and how it just stopped working and there were no plans to fix it or any notification whatsoever? I bought a Chicken Nugget license, and soon after the developer just abandoned it because he didn't feel like supporting it anymore. Again well within his rights, but it screwed me and others over. Then he has the nerve to leave it up on his site for anyone to buy and be unable to use. Hell no. Fortunately there's TwBlue and now I use that. I also had a Captcha Be Gone plan, and then that just stopped working without notice too. I don't know if it works again, but it's still up there for anyone to buy and get screwed over if it doesn't.
It's neat that he's picking up the project again, but I'm not going to use his apps again if it's just a hobby he just loses interest in one day and treats his customers like shit. Fool me once, shame on you. Fool me twice, shame on me. Maybe after he fixes his reputation some, then I'll consider it.
Also, there isn't even any sort of terms of use or anything on his site as far as I can tell. I forget if there's a license agreement in the programs themselves, but really?