@Helen3 please check your position in private mode search for a specific date and search criteria, and check it again after opting out. I have a feeling it will be the same, as I doubt search rank will have been updated to include this Services issue. My concern is, if many hosts choose to opt out, it may not be long before those who opt out get pushed down in search results to encourage opting in (as with Instant Book). The guidelines for search results are vague - I think perhaps whether you're opted in can be seen as a measure of Quality or Popularity:
Quality. The algorithm assesses many characteristics to evaluate listing and trip quality, including the listing content like photos and videos, ratings and reviews, and listing characteristics. The algorithm also considers customer service and cancellation information and amenities for homes. Higher quality listings with better ratings and reviews tend to rank higher in search.
Popularity. The algorithm evaluates the popularity of a listing using a wide range of information, including how guests engage with the listing. Examples of guest engagement with a listing include how often guests save a listing to their wishlist, how often guests book, and how often guests message the host. More popular listings tend to rank higher in search.
In both cases the measures include the stated things, but they are not (or will not necessarily always be) limited to what is stated.
There's also the possibility that it could at some point in the future be made clear (instead of hiding it) that you'll rank lower if you opt out, as is the case with Instant Book.
Another possibility is that Guest Favourite (which also has a vague definition) could in future take into account whether you allow Services.
The only reason I'm not kicking and screaming, is because I doubt that my guests are likely to book these services.
