An update: after discussing centipede errors and region blocks, I was informed that all Destiny 2 releases (all platforms) utilize the Steam Relay for various network protections. As such, Steam being blocked would have an adverse impact on Destiny 2 playability in Indonesia. That said, I did read that Steam is working on becoming compliant with the regulations so this issue should clear up sooner rather than later.
I've checked pinging bungie's server (18.104.22.168) with all RTO and 100% packet loss. I don't know how the relay mechanism with steam were but logically pinging Bungie's direct server wouldn't take steam relay in consideration, no? So the test proved Bungie's server was blacklisted and thus required complying to register with the new regulation?
That's not how Destiny works and most game servers don't allow ICMP requests, usually they reserve a separate IP or domain just for this.