I actually spent quite a bit of time trying to piece together information about Rubiktrade.com after seeing similar discussions elsewhere. What stood out to me was not necessarily any single red flag, but rather the lack of depth in available public information.
For example, when you look at well known brokers, you can usually find detailed regulatory records, company history, leadership background, and even past user discussions going back several years. In this case, the available information feels limited and somewhat surface level.
That does not automatically mean there is a problem, but in financial matters, absence of clear information can be just as important as negative information. I would personally prefer to see more transparency before considering anything related to it.