A crazed tile will still perform properly and there is no reason for concern. Crazing can often be seen in old or antique pottery or chinaware.
If we consider that a tile is a glass surface on a clay background and when 'fired' in a kiln, the two materials bond; crazing can occur when the glass and the clay expand or contract at different rates in an installation.
The important issue is that a crazed surface is not a crack through the tile.
A crazed surface will not affect the performance of the tile. Generally, most people will simply ignore the issue.
If your project seems to have an extreme case, or it is personally annoying, then the only way to resolve it is the replace the tiles.
The cost to replace crazed tiles can't be charged back to anyone in particular.