If I understand correctly RSK allocates a certain percentage of mining back to dev funding.  If RSK is open source wouldn't it be possible to fork the code and remove this "tax" on mining?  The same thing happened with ZCash and there is a fork of ZCash called ZClassic without the tax.

It seems like bitcoin sidechains that are open sourced will always be forked from one "inefficient" form of money to another.  So to create the best coin you have to make it appealing for all users.