It is true that all or almost all cryptocurrencies seem to move together to a large extent. I still find the chart pretty interesting (the movements of which show how SBD and STEEM sometimes don't move together), especially the reversal when the soft limit was hit, which seems to say quite a bit about the pegging mechanism. But of course I can't prove any sort of causal relationship from a chart, it could be coincidence or some other factor involved.