What makes their platform scalable? How can we be confident in their ability to handle volume?
I do not understand your question. What exactly did you mean? What kind of work will developers not be able to cope with?
What are they doing differently from platforms like SKYHOPECOIN, bounty0x or UBERPRO? Are they just more competent? Or are there significant differences in the tech that enables scalibility?
I checked out SKYHOPECOIN and the team is like Anime Characters and looks unprofessional for me, so I will not take them seriously!, for uberpro I saw of video from famous guy in crypto space making fun of their video on one of his video, but I haven't check their project to be honest. Any freelancer is huge field and there are many projects, you just need to have loot at previous comments that explaining how CryprtoTask platform works and compared that to those other projects to have your own vision.