This is lacking clarity in the payment schedule... Is it One-time? Monthly? Yearly?
" + No server involved (zero subscription fee for you!)
...
Unlike other web scraping softwares, it requires only one time payment to scrape for unlimited time and data. No more subscriptions or huge fee for your small data analysis projects! "
Still a cool project but I think this limits a lot of its utility. Providing an API to access the data as a service would be a lot more profitable.
Scrolling down:
" Can I scrape password protected stuff with Spider?
Yes! It’s a browser extension, so as long as you log in first, you can scrape whatever you like. "