Wireless networks "hotspots"

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[mary]

Hello, I am new to this telecommunicatiopns forum, could anyone please let me know about the legality of "hotspots" for the internet, I am wondering about their security and legality and I would like to know
1: If using them is illegal in any circumstances (including website browsing, even less salubrious websites)
2: If use can be limited or capped in any way
3: If use is anonymous
4: If use is anonynous, are other users anonymous as well, since I would not like to think of how these hotspots could be abused by malicious predators/ harassors / wrongdoers
5: If credit card information sent over this hotspot is secure from the owner(s) / administrators of this network
For example, the hotspot in Leicester Square, london, must have many many users daily, presumably they are all logged and monitored. How does this work?