Google reserves the right to add some form of compulsory advertising to their map area, although they haven't yet.
If this did become the case, we would consider purchasing a "no-adverts" Google maps license, ensuring that premium pins remain ad-free. However this is currently only available in the US or Canada, so we cannot guarantee that we can remove compulsory adverts from Premium Pins.
To give you a bit of peace of mind: if you purchase a Premium Pin, compulsory ads did start appearing and you wish to cancel for this reason, we will refund your fee on request on a pro-rata basis, based on the date of your cancellation.