They probably don't care or think they have nothing to hide or probably never stumbled across numerous self hosted alternatives
But also, I use Headscale so I'm self-hosting my tailscale as well.
As a self-hoster, I would totally recommend to the average person to self-host services on your LAN, and just use tailscale to extend your LAN beyond your house (for example on your laptop and phone) so you can get to things when you're not at home. Don't let perfect be the enemy of good.