....If there are conditions then it's not open immigration, open immigration is a unconditional open flood gate cluster fuck.I would imagine there is some immigration, taking into consideration what the people on Earth want their planetary population to be, and vetting the applicants for the best of the best in terms of graduate degrees and skills.According to Robert Heinlein, that's how the moon obtained it's political independance from Earth. Hopefully Earth has a better policy on that than the Federation's policy on "no gays allowed."
Knowing what human nature is like I can see human racism being swapped for human speciesm - Being the first to do something ' not the norm' is not welcomed with glee in human culture especially when it comes to sex and relationships. And other species might be just the same e.g A Vulcan with a human might be considered illogical or insane