What is the ruling on working to restore network equipment (routers) for a company that uses them for the lottery?

Is it acceptable for his salary to be a percentage of the income of the dentist’s clinic, in addition to a fixed amount?

The tasks at work are too many, and he manages to do most of them, and he makes it look as if others are done, but they are not really done. What is the ruling on that?

Does keeping an eye on colleagues and writing reports about them come under the heading of spying that is forbidden?

What is the ruling on working for the Amazon Mechanical Turk website?

Ruling on building houses and installing cables for TV in them

Working as a programmer for websites that deal with credit cards