Another difference lies in the vision of the #DevelopmentTeam : they may want to operate for a long time, or they may want to seize users' assets when they suddenly need money for some purpose in real life 
a clear difference between a platform is how they operate some platforms are a little less dignified because even if they did not intend to scam people before starting their operations, they might later down the line encounter some challenges that would lead them to consider take money in an undignifies way some platforms may encounter some problems but they would simply just shut the operations down and think of other ways to solve the problem there is always this concern you just have to hope that the #DevelopmentTeam genuinely cares about the community
Obviously, a genuine mixer platform will not shutdown it's platform unannounced. First, team should be able to send out informations to it's users based on either, a maintenance purpose, or on a normal routine oparetional upgrades as the case may be
Infacts, for mixer to shutdown mixer it's platform because of certain problems encountered is not the best, it could be interpreted in different ways by users and it is not the best practices in any economy like the Cryptocurrency ecosystem.
You see, there are better ways to channel issues if it is beyond management control, and if team genuinely care about it's users they should be informations, In most cases, team may suggest to users for a vote to shutdown operations for a little season to pave way for platform maintenance, upgrades, repairs etc
In my opinion, shutting down mixer platform without any information, in most situations can be exit scams