One way they could increase the housing supply is by severely taxing corporate ownership of single-family homes (and possibly low-occupancy multi-family homes like duplexes).
Give it a grace period, say… 3 months (to cover the cases where a bank forecloses and is sole owner while the house is auctioned), then charge like 95% tax on market value every quarter.
Signing every message should have zero effect for people who don’t use PGP; they’ll just have a cryptic block of text at the bottom of the message you sent.
It’s overkill to ship your pubkey with every email. Most people just publish to a trusted keyserver and call it a day since pretty much every client worth its salt can look up your pubkey directly.