Every PRNG is an excellent compression algorithm for particular kinds of random data. Actually every kind of unbounded size random data is generated by a device

Every PRNG is an excellent compression algorithm for particular kinds of random data. Actually every kind of unbounded size random data is generated by a device that doesn't contain all of the data at the start. These algorithms may not be generic, but a generic algorithm is not useful because you can always can just generate another random data set from scratch.