Most EU jurisdictions have required minimum capital contributions from the founding shareholder(s), e.g. 10-20.000 euro per entity. Then there's a ton of stuff to file (some countries are more bureaucratic than others), in some jurisdictions you need to visit a civil law notary to incorporate, etc.

A lawyer can easily take care of that for you for a reasonable fee, but most bootstrappers won't consider it, given the price.