Why surprised? It's rock solid, stable, fast, and does pretty much everything you need, and nothing is hidden behind premium tiers, unlike nginx where they leave bugs and awful behaviour in the open source version that aren't in the premium ones (e.g. nginx used to only resolve hostname entries on start-up, https://forum.nginx.org/read.php?2,215830,215832#msg-215832, so if you used a hostname in proxy_pass, and the DNS changed, oops sorry. Actual honouring of DNS TTLs used to be a premium only feature)