What is the point? They will pay a fine and move on to their next exploit. Maybe the punishment should be to force them to spend as much money/time/effort as needed to regrow the entire forest, all 250,000 trees, and then some. Even if it takes 20-30 years - pay for reforestation, hire crews, pay for inspections/watchdogs to monitor etc
If Finland prohibits them from continuing construction, they don’t get the data center they want, and they have to start over somewhere else.
The real punishment arguably already happened. This could have been a feel-good project with lots of positive PR: a datacenter built far from major population centers, in a place with lots of available water that isn't used for anything else, in a country with relatively cheap electricity that is overwhelmingly produced from nuclear, hydro and wind. Amid all the negative datacenter PR it could have been a project Google could point to where every single objection has been addressed. Instead it has become a PR disaster that has been dragged through the news cycle and social media's outrage cycle.