I feared he would be martyred, when he returned to Russia after getting poisoned by the FSB and helping Bellingcat track down the agents who poisoned him (nobody in power did anything about them). Back then, his life was saved by a pilot deciding to make an emergency landing and a doctor suspecting a neurotoxin.
What finally took his life will be difficult to ascertain due to lack of transparency - a remote location, an extremely authoritarian system, war, politically controlled law enforcement and courts. Still, a day before death, Navalny appeared in court for another potential addition to his already 19-year sentence - in good spirits.
During Navalny's imprisonment, the regime made a sustained effort to break that spirit, issuing a constant stream of disciplinary punishments (a total of 27 times): for not placing his hands behind his back, for incorrectly introducing himself, for uttering a profanity, for failing to clear leaves in the yard, for citing the European Court of Human Rights’ demand for his release, for addressing the guard without using a patronym, and for declining to wash the fence.
They also transfered him to the far north and previously used sleep deprivement against him. I tend to assume that they also killed him, either directly or indirectly.
He was definitely not the perfect politician, but did things which a common politician never dares to do, which suggests having some principles. When they came for anarchists, he didn't forget them, but also spoke for anarchists.
Relays: my use for truck relays is switching on heaters in my thermal storage water tank. Not big ones, though - I use relays rated for 24V and 40A of current. Since they are old, I have applied a safety margin and only let 25 A flow through them, so each of them handles 24 x 25 = 600 W.
As for using DC appliances: benefits do exist. If a household has a low voltage DC battery bank (some do, some don't) then dropping the battery voltage a few times to power car parts comes with a smaller efficiency loss. In my household, DC appliances are used for lighting, communications, computing, cooling food, pumping water and soldering electronics. The rest goes via AC. I think a car air conditioner could cool some small storage room decently. With big living rooms, it would have difficulty since it's a small device.