I think you mistook Finland with Seychelles you cannot register a business and be regulated by financial service FSA with virtual info.
Thats why since 2019 Localbitcoins started asking for verifications and limits and more strict . You should get your facts right befor acting like some advisor.
The one who is not knowing what he is talking about is you:
https://www.prh.fi/en/kaupparekisteri/rekisterointipalvelut/rekisterin_tietosisalto.htmlInformation entered in the register Description of entry
~
Postal address, street address, email, telephone number, website address
The business register address you've linked to accepts postal addresses as main addresses, there is no law in Finland in which any company must disclose all its working addresses, you are allowed to have as many as you want and just list one in the register.
Second, Localbitcoins is an Osakeyhtio, a limited company, as you can see in the registry form:
https://www.finlex.fi/fi/laki/ajantasa/1979/19790129There is no mandatory fixed address required, but a postal address or the municipality from which they operate.
And it's not just Finland it's the EU or even the UK, for example, Binance is operating in the Uk as Binance Markets Limited, their address is a virtual one, home to no less than
111,446 business or Bitstamp operates from a
200 shared offices in London or the same in Luxemburg and the myriad of examples can continue.
But you're free to go down there and wait for their CEO, post a selfie with him and prove me wrong.

As you still dont know the difference between registering a business and being regulated by a financial institution
Its not a business to sell chinese products on a shopify site .