HN user
It is used mostly by those who resent the dominance and techical superiority of American tech companies, because it is based in france.
Or maybe because they are subject, as an European company, to GDPR?
If I remember correctly, they did so in the early days - but should be using their own crawlers now.
fast.com speed test on iPhone:
* Hi3G (Carrier Aggregation) without WARP+: 39 Mbps
* Hi3G (Carrier Aggregation) with WARP+: 39 Mbps
* Hi3G without WARP+: 12 Mbps
* Hi3G with WARP+: 32 Mbps