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I assume you mean beneficial to humans?
Viruses make up a large portion of Earth’s ecosystem, and a large class of them help keep bacteria in check.
https://en.wikipedia.org/wiki/Bacteriophage
There are even efforts to try and harness them to treat bacterial infections.
There are viruses that make some plants look more appealing to some people. For example they are the cause of these striped patterns on tulip petals.
Some viruses are useful for studying genes - you can make them transfer a genetic sequence into a cell.
They can be used in gene therapy - a very promising field of medicine.
And some viruses could also be used instead of antibiotics, which could potentialy solve the resistence problems and also help avoiding collateral damage to symbiotic bacteria. (Research of this technology is quite old, unfortunately it was abandoned for a long time and everyone focused on antibiotics instead.)
Probably, yeah. Their whole schtick is to move DNA around and fuck up genomes n shit. They’re evolutionary drivers.