I think it's specific pedals only, that rely on old analog chips no longer in production. Behringer owns a company, Cool Audio, who makes clones of old chips that have become rare and very expensive on the new-old-stock market, like BBD-chips that are no longer being produced by the original companies. Source and more info here:
What's the Deal with Behringer? — The JHS Show
Those BBD-chips are used for certain
analog time-based effects, like chorus and delay. For example when it comes to analog chorus pedals, most are based on Boss CE-1/2 or EHX Small Clone. Both use BBD-chips that are no longer in production, but now fairly cheap clones are readily available from Cool Audio. They also make clones of VCA chips used in certain compressors/limiters.
Regular op-amp chips and transistors used in overdrives, fuzz, distortion, EQ, boost etc are made by lots of different companies (Texas Instruments, ST, NJR/JRC etc).