PLease explain the meaning and punctuation of this sentence
Some ten years ago, when Google started to dominate the search scene in many countries, a number of concerns were raised in publications like Weber 2006: Nobody could vouch for the reliability of search results; why query-answers were ranked the way they were was often unclear: Google was, and is, not 62 How Dangerous is the Web for Creative Work? obliged to crawl all servers, nor is it impossible or illegal to adjust some rankings according to some criteria, including commercial interests or knowledge of who is querying or where a query comes from.