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godzilla beasts. Add them Tynan!
I don't feel like a super futuristic government would make the careless mistake of dumping experiments where they can not only survive, but also exist where potential future colonies could. There's far too many humans in existence at this point for them to coordinate fully or really care about every individual, but there's a few very classic examples of how to bite yourself in the ass. Among those are not terminating experimental subjects you're through with.
A future humanity wouldn't be that stupid, basically. And that's not even considering how one would code any of this.
You also spelled "experiment" with 2 i's. Don't do that.
I think the idea of it being based on subjects escaping labs or even biological warfare would make a lot of sense. After all, genetic engineering leads to many things, and advanced governments mutating highly dangerous beings to eliminate a hostile Rimworld group would be a viable option.