when I started with mobile apps google was easy and apple was a problem.

nowadays apple is very clear on what they allow and what they don’t and it’s possible to go back and forth with them to get something approved.

google is trying their hard to be as strict as apple while putting 0 of the effort in to correct problems. not to mention that android is a fucking piece of garbage to maintain. you have like 4 deadlines per year, you need to update this or that thing or your app won’t work on this or that device, or the deprecation deadline for fucking safetynet arrives and they take two weeks to repair the google play integrity service.

I’m fairly new, what are the tools?

The CEO of Nintendo of America is curiously also named Bowser. Seems they are going out of their way to find them.

I don’t have experience with Proxmox specifically but usually the policy at play during forwarded traffic is not of the INPUT but of the FORWARD chain.