When you say open a port – do you mean on your router via port forwarding?
It seems Blynk is the preferred way the developer use for remote access and it doesn’t require inbound access so not sure if this request would get much priority. I can look at adding it my firmware branch but not sure even with that how confident I would be putting this on the internet… there fundamentally isn’t any sort of protection for brute force attacks on the web API or Denial of service attacks…
Is there something IFTT does that you can’t get via Blynk?