Back in the early days, watching a cammed movie was tolerable because the 480p rips that we'd otherwise get were so heavily compressed that there'd be hardly any step up in quality. It was also usually the fastest way I could find a new movie.
These days, releases get leaked from inside the studio all the time, at full quality, so there's not really any legitimate need for cammed movies anymore.
I would not say “all the time” at least the movies I watch, but it is mostly only some months (if even) until a movie is available on some streaming service and gets ripped in 4k