IPFS (InterPlanetary File System) is a peer-to-peer protocol for sharing and storing files. Nodes running IPFS act as hosts for content, and the network is designed to be resilient and decentralized.

ZLT say:

IPFS (InterPlanetary File System) is a peer-to-peer protocol for sharing and storing files. Nodes running IPFS act as hosts for content, and the network is designed to be resilient and decentralized. 

To answer your question, there may be some Yggdrasil users running IPFS nodes for bootstrap on the Yggdrasil side, but it would depend on individual use cases and preferences. Yggdrasil and IPFS are both decentralized and peer-to-peer technologies, so they can complement each other well in certain scenarios. 

That being said, there are some technical challenges to running IPFS over Yggdrasil, such as the potential for slower transfer speeds due to the nature of Yggdrasil's overlay network. Additionally, some nodes may not be reachable via Yggdrasil due to network configuration issues. Overall, running IPFS nodes on the Yggdrasil network could be an interesting experiment, but it may require some technical know-how and configuration to work effectively.