Wow that is very generous of them. Terra has really come a long way and integrates into the workflow really well.
I can't tell if he said 3 months for the 4T or 30 months.?
I use Agisoft Pro, but if they give me Terra for a year, I will put it through the ringer. I will most likely reprocess a large amount of older projects as well.
I am really excited about several of its features, but the Smart 3D capture looks really amazing. Generate a point cloud on site in 5 to 10 minutes. Then have a custom flight route with consistent GSD around the structure ensure proper overlap.
The Mavic 3 Enterprise series also had a free limited subscription to Terra, but I think this one is longer.