It is proper Netiquette to respect the bandwidth of others. Don't download large files or stream in crowded hotspots without a good reason.
Sharing Wi-Fi means you are a conscious user who restricts use during peak times to allow other users to connect as well.
Download large files from shared internet connections when network traffic is lowest. This shares your connection with everyone by allowing others access to the same amount of bandwidth.
Don't download big files or stream during peak hotspot times because it slows down the network.