There is always opportunity to speak out.
In dictatorships, it usually costs more energy, money and sometimes lives. It tends to culminate in revolutions, and then the system changes.
In censored quasi-democracies like what we see in "the west", it tends to culminate in being ignored and the status quo being maintained or gradually worsened. Alternatively, you may become a pariah and either have to self-exile [0] or suffer years of isolation and torture [1].
[0] https://en.wikipedia.org/wiki/Edward_Snowden#Asylum_applicat...
[1] https://en.wikipedia.org/wiki/Julian_Assange#Imprisonment_in...
