Promised a 6 month period. Got used for 6 weeks then let off - Virtual Artist ETS Express Employee Review

I was promised a 6 month tentative position before a review period. Worked 40 hours a week and was being trained. I was told I had a 3 month training period to learn everything, then a 3 month period on my own before being reviewed. They let me go out of the blue at 6 weeks a long with a lot of their other newer employees. Few months later I learn from a reputable source that that practice is normal for them. They will hire promising a full time position review at 6 months, but let you off at about 6 weeks after busy period is over.