An entire subsection of the financial services and compliance SAAS market is focused on selling
CRS parsing and automation solutions to tax authorities.
The ROI calculation is a no-brainer. Spend a few hundred thousand on a piece of software to collect millions in unpaid taxes.
We'll see if the rest of the world takes a page out of US' playbook, where
FATCA non-compliance comes with a 30% haircut one every USD transaction. Currently no such mechanism exists but it probably wouldn't be hard to get enough EU members to agree on it and have ECB implement something similar. Another weapon they have in their arsenal is to threaten to blacklist the whole jurisdiction if a bank is misbehaving and not being punished for it.
Time will tell.