Using CloudFlare and using the cloudflared tunnel service aren’t necessarily the same thing.
For instance, I used cloudflared to proxy my Pihole servers’ requests to CF’s DNSoHTTPS servers, for maximum DNS privacy. Yes, I’m trusting CF’s DNS servers, but I need to trust an upstream DNS somewhere, and it’s not going to be Google’s or my ISP’s.
I used CloudFlare to proxy access to my private li’l Lemmy instance, as I don’t want to expose the IP address I host it on. That’s more about privacy than security.
For the few self-hosted services I expose on the internet (Home Assistant being a good example), I don’t even both with CF at all. use Nginx Proxy Manager and Authelia, providing SSL I control, enforcing a 2FA policy I administer.