So much that can go wrong and equally right, hence they are testing this. Though a small test will be isolated from all global country impact and bias towards a false positive due to small impact. If that is projected to the entire country then and only then will the impact be truly seen.
But be interesting how this works out, I'm sure the initial trial/test will work out but once you scale that across a country then you start to see the true impact and outcome.
One question to ask yourself, when mortgages and taxes increase the costs of owning a property - have rents ever gone down! I'll say no upon that.
"Because the supply of land is essentially fixed, land rents depend on what tenants are prepared to pay, rather than on landlord expenses, preventing landlords from passing LVT to tenants."
Unlike property tax, LVT only taxes based on the land itself, and so doesn't disincentivize more productive (i.e. costlier) use of the land.
[1] https://en.wikipedia.org/wiki/Land_value_tax#Economic_effect...
When you project a local experiment to an entire country, don't forget that a concept similar to UBI known as "communism" has been tried before in the USSR, China, Cuba, and a few other countries, with limited success and many downsides.
But excellent comparison with communism and indeed that is comparable upon many levels. Though more niche in this aspect it still falls within that stable of thought. As an aside the only example most people aware of in which communism style approach works would be the Star trek universe. Which only add's fuel to the old saying "money is the root of all evil".
Certainly be interesting how this pans out and I'm mindful that if this was a whole country taking part that the true effect would take a few decades to get a true picture of the impact. With many aspects coming into play and let us not forget economic migration and with Finland part of the EU Schengen project then that aspect might be more impacting than envisioned. After all look at Spain and the UK free access to health care and how that is impacted by free movement, certainly not inconsequential.