Western Europe here. I’m old enough that I’ve had to file many paper tax forms. There have always been free services to help with that.

Now you can do it all online, and the known information is pre-filled. The last few years you don’t even have to click “accept” anymore, accepting is automatic if you don’t do anything.

That said, there still are paid services, but their main aim is to find all the ways to reduce what you pay (and they are likely used mainly by the well off).