gzip is fast, gzip -1 is even faster, gzip has low memory requirements, gzip is widely adopted. Those are the reasons of gzip is still being used, and why gzip has future. I.e. the gzip "ecosystem" is rich and useful, despite not being the best compressor in terms of compressed size.
P.S. There are gzip-compatible implementations with tiny per-connection encoding memory requirements (< 1KB).
P.S. There are gzip-compatible implementations with tiny per-connection encoding memory requirements (< 1KB).