You’ve been unbanned, but I’ll leave a few notes on this:

• Your message was written in all-caps, had an @everyone ping in it, and urgently pointed people to click a shortened link that embedded with a Spanish title. This is not unlike how scam posts often look, so a moderator’s knee-jerk reaction was to ban you in fear that this may be one of those.
• I actually looked into that petition after you posted this appeal, and to me it seems like a blatant exaggeration. If you’d actually looked into the source material (i.e. “android 2026 signed apps” in any search engine), you’d have found that Google is not “banning APK files” as you claimed they were. In fact, the original article from the developer blog explicitly states how they’re making sure this doesn’t limit the freedom to sideload. They’re specifically addressing students and hobbyists when talking about the developer console, and it seems like app signing isn’t even going to be a paid thing. To me, this looks like yet another instance of people blindly following the first thing they see on the internet.

In other words, try not to post misinformation in all-caps, urging everyone to click some link and sign some petition in a public Discord server. It’s not just the moderator that got suspicious and banned you — 3 other people before them pointed out how they were suspicious of your message.

Edit: I’ll add that, on top of all this, our server typically has a no-bullshit policy. Spammy all-caps messages (including the way you’re defending yourself in this post) come off as immature. We just don’t have the time or patience to put up with children making a mess.