The downside is that the site will be broadcast to the IPFS DHT so if your site it sensitive before deploy it may not be suitable. And of course if you aren't going to deploy your site to IPFS at the end of the day it doesn't provide much benefit over a service like this.
[0] https://gitlab.com/kevincox/ricochetrobots/-/blob/98f5140898... [1] https://infura.io/docs/ipfs/post/add