As already pointed out the dividends would likely divide / split by the same amount.
I believe in the early days of FI there was only media buzz at 20p a share for each winner, they then did a 4 way split, so if you had 100 of Pogba you now have 400 but each time you won you'd get 5p a share (this was how it was when I joined) So essentially everyday Pogba wins you'd still get the same payout because you have 4 times more.
The major advantage however is that now Pogba instead of being £12 a share is £3 a share = much more attractive for new users. And when his price increases to £3.01 your portfolio goes up £4 (as you now have 400)
So from what I understand it really benefits the established traders but doesn't particularly harm new users, because if a new user today pays £12 a share for Pogba and earns 10% in buzz (i.e. £1.20 a share) in the future they'd pay £3 they'd still get the same 10% return only now it's 30p a share.
If the prices then rose back to where 1 share in Pogba was not getting such a good return %, FI would probably then look at increasing dividends again (as they did in the past with the introduction of PB payouts) but this would then be a question of financial viability for FI.....