To get a warning around, to make a player aware of serious rulebreaking, Jagex/JMods will raise 1 ban to a player to get their attention, to stop doing what they shouldn't be doing in the first place.
No, if there was serious rulebreaking, they would ban every account, not ban 1 to send a "warning". None of the other accounts have been banned since.
1 Account actioned out of 55 accounts is clearly a severe warning to stop doing what you had been doing and rethink your gameplay as you're walking a really darkgrey area, or at the wrong side of the Rules of RuneScape and/or Terms & Conditions.
There was no rethinking the gameplay as my gameplay wasn't against the rules. It got banned with a macro (permanent). And I have not used any macro's on that account as I have detailed that I only went on it to update g.e. offers, do daily challenges, and treasure hunter. Then I logged off to do the next alt. They can easily verify this if they choose to do so, they do not.
Clearly you are mistaken as you have witnessed yourself on 'Reddit' and there have been similar cases in The RuneScape Official Forums where Mod SteveW did step-in after conducting a thorough investigation.
Clearly not, it was only a small handful of people. This isn't a thorough investigation. And had been the case on reddit and twitter that only a lucky few manage to get a response after tagging a specific Anti-Cheat specialist on social media, which is outside of the Jagex official channels.
Mod Steve W publicly made a post regarding an "incident" where they have unbanned a significant amount of players due to the "incident".
When there is an outcry from many in the community, especially when it comes to streamers, they do something. Otherwise for the normal player, it just falls on silent ears.