Can we think that Bitcoin can help governments that are in a boycott?
Sure it can.
Anonymity works for users and institutions as well.
The most notable point is that the boycot policies to be overpassed. In simple words, let's take the example of Isreal which is boycotted by (almost) all the arabic countries (+some others in South America); Isreal desrerves the boycot as a punishement policy against what she is doing in Palestine. Infortunetly, Isreal is a major player in the crypto industry and can easly evade the boycot by just using crypto, which supports its insolence.