Which, unfortunately, our secret intelligence services are legally able to do. Unlike in the US where it would likely be against the 4th amendment, ours are allowed to hack any computers/network equipment and enter premises to plant listening devices, alter computer equipment, etc.
The most problematic bit is that they are allowed to do things like alter timestamps in files if required to conceal their hacking, which could potentially be destroying exonerating evidence if the target is innocent!
If James Bond is after me, the government is putting a lot of resources into me. I do not like that current message platforms make snooping so easy. Getting back to a situation where non-trivial effort is required to snoop puts me back into a realm I'm used to thinking about.
1. Open Source software is better prepared to deal with this kind of threat.
2. Self-hosting the encrypted communication platform means that there's no one but you for the Govt to approach