Are we going to get charged some "membership fee" to our credit card without our knowledge? How do we decline this?

This community board is for sitters and owners, but it is not where you contact Rover Support for policy answers.

Yes, there is a fee change going into effect in select cities now for new customers. This is the thread where it has been discussed:

https://www.rover.com/community/quest...

If you have questions about how/if it applies to you, I suggest you call Rover Customer Support at [Edit: Rover’s contact options have changed. Visit the Rover Help Center at https://support.rover.com/ to find the phone number, help articles, or chat with the team]

When you book a sitting engagement, I would imagine the service fee, if applicable, would be on the invoice and not hidden.