It's going to be terrible situation for tech start ups but it's been bad for everyone for a while who sells across borders in EU. You have to find out what strange box defined by eurocrats that your business fits into (if any). It's not that easy.
I'm a lawyer selling most of my services across borders. Some of my revenue is purely digital (downloads of documents and may be hit by the new rules), some would be characterized as consultancy services. If my client is in another member state and is VAT registered (like most, but not all companies) I don't have to charge VAT. But instead I am left to explain to my client that the mess is now theirs due to the weird chargeback rules (that they only know if they are used to selling B2B or buying from suppliers in other member states). If I sell services to private persons or companies that are not VAT registered, I have to charge the VAT of the country my law firm is in.
If I had given legal advice related to real estate I would be subject to yet other rules.
When I sell to companies outside of the EU it's a different set of rules again.
Most bookkeepers and accountants are very insecure about these rules. If professional accountants are not comfortable advising on the rules, the system is too complicated.