Releasing formula will help in transparency . Zulu allows 10 accounts/email :whistling .
With Collective2 you can trade FX mini lots but not micro ,FX leverage 33:1 for the provider , you can open trades as you wish as long as you have sufficient funds to cover the margin . Performance is based on percentage gains not pips and points , real Max DD data with other statistics . You can trade futures contracts , stocks and options , margin required for futures contracts is determined by the exchange , but it is not preferable to trade different markets in the same provider account .
Much like Zulu most providers don't get decent followers but some do get and it can pay nicely for the good provider , some providers have made $ 100s K in the past but that's rare .
With forex you can have more subs , anyway subscribers there seems to have more money than Zulu's followers in general , and it seems most of them don't tolerate averaging-down strategies . Bottom line if you are a real good trader you will have followers with C2 that's for sure unlike Zulu which you have to be a very risky and a martingale trader , not to mention the number of providers competing in C2 is much less , go to the grid you will see 800+ active accounts competing in different markets ,180 of them are FX accounts .
Recently C2 released the non-US site " you get paid /trade not by monthly or weekly subscriptions " but i don't know about the traffic in the non-us site .