Good day BTT Famz, is there any danger at all using DNS server on a android phone?

Smartphones of today comes with feature where you can change your DNS server and this help my phone to speed up when browsing.

I have to be careful with every changes I made, just in case, so I want to know if there are any history of hacks through DNS servers or even Data leaks.

The last is, how possible of leaking your recovery seed through the DNS server? Never heard of this but gotta be very careful.