Unpopular or Private DNS Servers - is their usage safe?
Recently I tried some private and not-so-popular free public and private DNS servers in stead of my ISP's (default) servers and common 188.8.131.52 or 184.108.40.206 on my pc router and also on 'DNS-changer App' for mobile. Somehow the connection speeds were quite fast (may be due to very less people in my country using them, but let's not go into technical of these speed test)
My main question is: Are such unpopular or private dns servers run by anonymous individuals or small companies secure for using billing transactions on eCommerce sites/web hosts or for opening my gmail inbox? - I mean, can they (the dns admin) sniff/hack/read/modify into my transactions/mails? OR they are good for normal internet browsing ONLY?