Because such hotspots can be done incorrectly and open your network to intrusions why not let the offer be hijacked and if there is a problem you are not the lightning rod to take the hit.

There's plenty on the web today about WiFi, security and more but nothing I've read lets you be an expert in a day. I've been at this for decades and still get some new lesson once in a while.

Here I think you should let them hijack it.