It was 1 guy with a weapon that the Austrian secret service was warned about. The media made it 6 people doing a huge thing, in the end it was just 1 guy with an AK47 apparently. Austrian intelligence was warned by the Slovaks about him and they let him do regardless. Just like the 9/11 stuff, they knew what was coming and they allowed it because it suited their political agenda.
1 guy shooting around doesn't justify chat apps being monitored. This is a political setup.
We need to leave the EU ASAP.