Not sure what you really meant in the title, but making it a legal tender does not mean that government are afraid of Bitcoin. Every single government entity out there would have just banned crypto straight away if they were indeed scared of it.
Adopting it as a legal tender is just a means of them to at least get something out of the people that are using it. Imposing strict KYC laws to many crypto apps like the ones I have been using here in my country so that they would trace me anytime is one example.
I know my example was not about "adopting it as legal tender", but you get the idea.