The problem is, it's not that easy to even make sth. like that really decentralized. There is always one person who can access the assets, as we do not have the means to do something like this only with the consent of x% of the members. Maybe I'm wrong, but with normal steem accounts, this is difficult. The more people have access to the assets, the higher the probability that someone will use them and run away with it.
I don't know if it's possible to do something like this through the communities, that only through common decisions the assets can be touched, someone with more understanding of the technology would have to say something if it's possible or not.
Since I'm in a bit of a hurry I just ran this through a translator, so don't be surprised if it says something confusing xD.
Out of interest: how bad is the English text above, from the perspective of a native speaker? I have the feeling that the translator will soon be able to translate it better than me
RE: SPinvest club members