[hpeinar]

Very interesting read as an Estonian. Apart from being legal, we even have a special field on our income declaration form (which we fill every year) that is specifically for money earned through ways like that. If I recalled correctly it's under "Income received abroad -> Salary and other remuneration".

I also run a donation based site (which also has ads) and I declare both of these on the form and pay my share of taxes from it. But it is then fully legal money and I can do whatever I like with it from government perspective.

I don't speak any Finnish at all, but if the wording is so important, wouldn't it work if you ask the money to pay for the services cost instead? Not as a donation to yourself. Servers cost, your time costs etc. Could all be counted as an upkeep of the project.