I have been testing Semdash and have been checking out the updates concerning the credit system. I reported (through another review) that even when you press your browser's back button, and even when the results are null, you are spending credits for the same (or for no) information.
I will keep waiting a little longer to see if this is fixed (as offered in response to other reviews) because it's a huge leak of credits to have them waisted like that. I believe it shouldn't be difficult to implement something more realistic for users not to waste credits when they are getting no new information or no information at all.
Other than that, the tool seems useful. I am just even scared to touch it because it feels like every move I make, it leaks credits.

--- UPDATE ---
The author replied that they have fixed the issue with going back to the same results taking your credits, but I just checked and just did 3 - 4 clicks on other pages, then clicked back back back to get to the results page and it still takes away credits. I have read several times that this issue was fixed but I can confirm that it hasn't (june 3 2025)