For example, no mainstream media outlet in the UK covers Al Quds day in London (absolutely nothing about this on the BBC or print media). Facts on the ground at the most recent (and previous) marches is that there is a lot of Hezbollah flags flown.
Another example is the BBC’s treatment of Brexit on three flagship panel shows, Question Time, Politics Live and Any Questions where Remain commentators outnumber Brexit commentators 3 to 1.
In this instance, Bloomberg seems to be wanting to push the 'Huawei is spying on you' narrative as well as 'Proton Mail isn't secure' narrative.
Make what you will of the points above, maybe they mean something, maybe they don't. I just keep an open mind, try to think for myself, see things from different perspectives, and do my best not to fall for my own cognitive biases.
I still use Proton Mail, and I trust their service more than GMail (I migrated from GMail to Proton Mail), but it's a nice reminder not to trust any corporation too much or get complacent with security. I really don't feel like rolling my own encrypted email solution so the question is, "Who am I willing to trust the solution to?" Ultimately I'm accountable to myself.
As for media bias, sometimes it is blatant, most times however I find it subtle. Either way it is pervasive. Unless you are scanning for it, I imagine it is incredibly easy not to think for yourself.