[teapot01]

This could be due to the fact that Target et. al. generally use cheap construction methods like steel frame with steel sheet roofing and cladding. If that's the case, you be effectively inside a faraday cage which would attenuate the signal.

Many larger public buildings and shopping malls often use distributed antenna systems (DAS) to improve coverage inside.

[bgreddit]

thx.. I havent seen this when I go into other big box stores. Seems to me like they want to force you to use their WiFi so that they can track if I am price matching or just window shopping at target!!. But it comes at a cost of safety which is what I am worried about!