On January 30th, 2014, Linden Lab updated its Bot Policy. The update is small, but potentially far-reaching, outlawing the use of bots for mainland parcel purchases.
Updated by Patch Linden, the revisions comprise two parts: a comment on the use of bots in mainland parcel sales, and an update to the policy itself barring the automated purchase of mainland parcels via bots, etc. In turn, these read:
Mainland parcel sales and bots
Some bots are used to automate the purchase of Mainland parcels priced below fair market values.
Using bots to purchase Mainland parcels is not allowed
The use of bots, autonomous software, scripting (manual or automated), scripted agents, or any systems or software internal or external to the Second Life service that circumvent, automate and/or remove the human interaction required to purchase a Land parcel within Second Life on the Linden Lab owned Mainland is prohibited.
With thanks to Mona Eberhardt.