I noticed while trying to use ?provider query parameter with @helia/verified-fetch that it does not get propagated to the block brokers, specifically to the trustless gateway in the same way as when one sets a gateway in the @helia/verified-fetch config. Resulting in basically being ignore.
This hack https://github.com/ipfs/helia/pull/815/files made it work for me, but I believe it may exist a better solution that I am not aware at the moment.
Thoughts @achingbrain