I would start considering the possibility of ION not being a scam if Ionomy

* posts all the premine addresses
* posts the addresses of all team stakers/masternodes
* posts the burn addresses of all XPY that were exchanged into ION
* shows the registration of Ionomy PTE in Singapore
* publishes one game a month like they announced they would
* stops selling offchain tokens such as "atoms" and "electrons" that have nothing to do with cryptocurrency
* stops selling hyperinflating wallets that have nothing to do with real POS
* stops selling pretty PNG files (aka "skins") for their version of hashlets
* starts giving real answers to questions in their public forum thread instead of giving useless pseudo answers in a chat

That would be a start.