Sweden is no guarantee--there are a dozen projects still competing for the e-krona gig. If it was guaranteed, it would be priced in, and it's definitely not.
All cryptos have seed/keys that you need to access your funds, they would be useless otherwise. You can use the trinity wallet now if you are worried about creating your own seed--though why anyone would use a random internet site to create a seed and then not change characters on their own is beyond me--how do you invest in crypto without even knowing how it works? And let me be clear, I'm not talking about future users when a mass adoption event occurs, whenever that is (Bitcoin included), but the 99% of current crypto enthuists who are basing value on speculation and should at least know what they are investing in.