Governments don't care much about Tor, for example, because they have very little leverage (and their law enforcement use it, but members of parliament also use Signal but can't admit it openly).
As for TOR, I'd wager governments love it. Everyone the world over has decided to congregate one one official "secret stuff" platform and get this: it's made by the US Government.
And by all accounts the US government is well able to spy on it - but won't say how instead preferring to bring up cases by parallel construction^. It's perfect. I don't know what more a government could want.
^ https://www.technologyreview.com/2020/02/08/349016/a-dark-we...
For my own company which does security research, privacy is critical. We bring in only people who have been trained to only access the channel from dedicated QubesOS VMs, with no mobile access permitted. This is not perfect but it is as reasonable best effort until we can run Matrix home servers in a TEE (working on foundations for this atm).
Signal by contrast demands a phone number and assumes mobile handsets can be fully trusted so it already has ruled itself out for high risk use cases.
Matrix on the other hand I can run a private server of, and enforce whatever rules are appropriate for my threat model.