I have straight bind running on my network already for local zones, it would be easy enough to switch it to be a root resolver. The only problem is it's a lot slower. I use DoT to cloudflare for non-local zones (using blocky); if you run a root resolver, your DNS traffic is all in the clear. Not like it truly matters but I wouldn't put it past my ISP to do DPI on DNS traffic to try to sell my data.
I trust them more than my ISP (Verizon). Quad9 is, and I used it for some time as an upstream, but it is markedly slower for me than cloudflare. Those milliseconds add up for an impatient asshole like myself.