Yes, but many hotel wifi networks didn't like me setting my own DNS servers so I have to switch it off regularly. I uses it as secondary on servers in case the hoster's DNS is down (well, ok, it only happened once).
I noticed that some of the cloud hosting services are slow when I connect to 1.1.1.1. For example I have some sites on Digital Ocean and the latency is super slow. I had to disable it because of that
I have been a regular user of that service for months but for some reason it’s making my internet slower since i watch YouTube on my phone
Yes, but they recently had a major outage that caused a lot of issues for me. I have since reverted back to the Comcast defaults of 75.75.75.75
Before Firefox implemented dns over https, yes, after that I felt no need to tinker with the dns anymore.
Yes, but I vastly prefer NextDNS.
How much does it cost and is it faster
If you make <300k queries a month, it's free. Otherwise it's about $20 a year for unlimited queries. I have the paid plan and it's great. I haven't done any speed tests but it seems perfectly passable in terms of speed, not to mention the fact that the sinkhole functionality helps me do a lot of host-based adblocking which is really useful for phones and smart devices.
I actually switched to NextDNS and honestly I’m loving it