Only encrypt private rooms

[Half-Shot]

We should never have encrypted public rooms

[jaller94]

Sounds like a good short-term mitigation of errors.
However, I think that there are valid use cases for encryption of public rooms, e.g. room is "public" but restricted to a closed homeserver.

[Half-Shot]

However, I think that there are valid use cases for encryption of public rooms, e.g. room is "public" but restricted to a closed homeserver.

This is the automatic encryption system. You can of course manually encrypt rooms yourself by toggling the bit.