I binge video while working. Can’t explain why, it just helps. I find audiobooks and podcasts require a bit more concentration which distracts me from working. Some times I put music on but it doesn’t help as much as video.
I don’t think the Telegram concerns are just privacy. I’ve read some mild speculation in other comments that the app may be compromised. 2FA will not protect you against a compromised app.
This page was the first result using Google with the query string ‘Thunderbird Telemetry opt out’:
Thunderbird Telemetry
On that page is list of contents near the top with this title link:
How do I opt out or delete telemetry data?
I don’t know if this information helps anyone concerned with telemetry.