The mod has stated they have automatic tooling for banning people who downvote on their communities and personally I was banned after one downvote.

Did you contact the mod directly? They’ve also said they’re happy to unban but you’d have to behave like an adult instead of throwing a tantrum.

It’s really not power tripping unless they directly refuse to engage and remove the ban after you’ve attempted to resolve it civilly. Mods often use tools to manage their responsibilities and tools can make mistakes, as can mods.

I mean, you can do whatever you want in the community you create

As long as it aligns with what you believe, otherwise it’s power tripping.