Is it bad to regularly use round up?

My mom owns a house she rents out. The old renters trashed the place so we are fixing it up. There are a lot of black berry bushes in the backyard so my mom had me chop them all down with a weed wacker, then she had me spray all the roots with round up. She said that we are gonna do that every time we go to work on the house which is every Saturday. Im worried because I dont want to fuck up the environment

Is it bad to regularly use round up?
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