429 error: Too many requests.
Just downloaded this npm and tested it 3 times. Got already a 429 error and can't resolve CAPTCHA.
'This page appears when Google automatically detects requests coming from your computer network which appear to be in violation of the <a href="//www.google.com/policies/terms/">Terms of Service</a>. The block will expire shortly after those requests stop.'
How many attempts did you try before getting the 429 error? Is it still working after several minutes?
When I did google-rank wikipedia.org --keywords 'best city to travel' like 5 times in a row, I have got that error. Problem is that I dont know after how long the block is gone.