[trinitry3]

> Why should any government incentivize that?

Well maybe they shouldn't, but it's shitty to apply this kind of policy retroactively. (I don't know when they actually announced the fact that you can't deduct losses.)

[brlewis]

https://en.wikipedia.org/wiki/Ex_post_facto_law#Finland

"Generally, the Finnish legal system does not permit ex post facto laws"

[zokier]

Strictly speaking I don't think this thing is a law, but rather a policy. Also the same paragraph continues

> In civil matters, such as taxation, ex post facto laws may be made in some circumstances.