It still seems like a waste of resources, to me.  Here’s his tweet from May, when he announced his continuing fundraising:

There’s no pressure, here. Once people have that initial burst of “right on” feeling, such billboards become part of the background.  When I looked into billboards years ago, they were about $10,000 per month.  Two months of that would fund a sizable grant for investigative work or other human activity that would genuinely keep the pressure on, whether by unearthing new information or engaging in activism.