Not sure people are complaining as such. And these comments are on a piece from a country's government that is literally offering to pay people to move there.
It's more of a word of warning, Finnish is a difficult language for a native English speaker to learn compared to, say, French, or even Swedish. Something like Spanish is spoken by a massive number of people in multiple nations - Finnish only in one small one.
I try and get by with Finnish when I can, but at the end of the day I still have a rather taxing (hah) job to do full time and I came here by choice so I want to enjoy it.
I'm not sure the "even" is actually appropriate here. Both Swedish and French (along with probably every other Western European Indo-European language) are among the easiest for English speakers to learn. Swedish also has a disproportionate amount of resources online due in part to immigration patterns, as I understand it.