Not sure if I am missing some earlier posts on this forum, but I refer to this on the Google Play update for MPQ:
Get 1000 Iso-8 Free for a limited time. ($2.50 Value)
The R46 update has arrived! Download it now!
** New events and episodes!
** An all-new tournament type coming soon!
** Iso-Powered characters now shown in Roster and in Battle.
** Lots of bug fixes.
For full (English Only) Patch Notes, please visit https://forums.505go.com
How do I get the free 1000 Iso-8?
The free 1,000 ISO 8 is a new account bonus only…
Recent patch notes that describe this: https://forums.505go.com/discussion/2296
Better question…
If 1,000 ISO 8 is worth $2.50, then the 500 ISO drops off each submission event are worth $1.25 each. (8 events * $1.25 = $10/day)
Where do I cash out my winnings, please? 
DOH! Thanks for bringing my attention to that post. It’s so hard to get more ISOs for levelling unless I spend more time grinding in PVP and PVE (wouldn’t want the boss to catch me playing games) or spend more moolah. 