Fresh Salad available to billboard climbers

In attempt to promote it’s fresh salads, McDonalds has begun installing billboards showcasing it’s greenery. Instead of using plain bold text, it’s using plants to fill in the bold text. Very Green. I wonder what happens as the plants become part of a larger system, where the billboards become nests for birds, rodents, and insects. Could billboards be become part of an ecosystem? Probably not part of the grand plan, and besides who waters them??