It depends on what your alternatives are. My guess is that it's not worth it because you still have to pay the taxes an employer would and what an employee would - social security and income taxes. You can take a look at the calculator: https://www.calkoo.com/en/salary-calculator

The taxation system itself is very simple, if VAT isn't involved. You can just enter your annual income and the calculator will tell you all of the numbers. Just make sure you use the "salary/wage fund" as the income field for a freelancer.

One thing to keep in mind though is that countries where you actually perform the work usually want a piece of the pie. That can complicate things significantly.

Thank you.

Not if you're doing the work in another country. You just end up owing taxes and tax returns to two countries instead of one.

From what I've read I would say so, it's super easy with their e-citizenship.

Only yesterday that there was an article in the Finnish newspaper Helsingin Sanomat saying that the e-citizenship is getting increasingly questionable.

Until 2 years ago the e-citizenship was good to open a bank account. After major money laundering scandals (probably unrelated to e-citizenship) you cannot only no longer open a bank account as an e-citizen, but even existing ones of e-citizens are getting closed.

A business without a bank account sounds highly limited to me.

One thing is easy but other thing is how "expensive" it is.