How sure are you that they deliberately tried to destroy your SEO rankings, and not them simply underperforming or messing something up? There's a huge difference between the two.
Also, whatever the Indian government's opinion on Bitcoin is, we can't assume that it will be the same for the people of India. I don't think there's any reason for the people to hate on Bitcoin to the point that they would actually try to destroy Bitcoin-related businesses that hired them.
more then likely they messed up the project without knowing it. dont think it is intentional as they need this job during this time of crisis. and a lot are desperate to get job and be paid.
be direct to your hired personnel and ask what the real problem is? maybe they dont know the impact of what they are doing to your platform. or as others have implied, they dont know what theyre doing, to the point that they f*cked up your site. sorry to say this but seems that this is your case here.
just hire a more competent individual..
I sure hope they care about having a job! I would love to pay a guy exactly what he's worth, every penny, to help build my rankings - not have them destroy my hard work.