R-Play - Remote Play for PS4
Yes, R-Play - Remote Play for PS4 has MFi controller support!
R-Play - Remote Play for PS4 on iOS does support controllers and is compatible with the MFI standard.
Regarding subscriptions: R-Play was previously offered as a free download auto-renewable subscription.
The R-Play auto-renewable subscription period is 1 year, with a 14-day free trial.
Your subscription will automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period.
You can manage your subscriptions and turn off auto-renewal by going to your Account Settings on the App Store after purchase but refunds will not be provided for any unused portion of the term.
R-Play - Remote Play for PS4 supports MFi controllers.