You have a choice
There is no reason to place DNS trust in the root 13 , any service can provide DNS trust and more importantly TLD for a lot less money. If you don't like it then stick to the authority file that came with your software.
Bandwidth doesn't cost what it used to, TB cost $10 a month not $10,000 like it used to.
It's just down to operating systems, or nowadays browsers as to whom you trust.