Why don't you get paid when you are on a strike?

Some trade unions pay strike pay to their members, but the employer can stop payment because you are refusing to work under their conditions. The employer can also stop contributing to the employees benefits during the strike time.

You get paid to work. If you aren't working you don't get paid.

You hire a landscaper to tear apart your yard and give it curb appeal.
You'll pay them 1,000 per month.
They take out everything then tell you they want $1,500 per month.

You refuse. They stop work and go on strike and picket the front of your property. The first of the month comes your yard is gone and they are picketing but they want the $1,000 per month you agreed to.

Are you going to pay it? Probably not. No work is being done so why would you pay for something you arent getting?

And that is why people on strike don't get paid. In order to earn money you give your employer something in return for the money. You are giving them nothing if you aren't working.