Likely, you're on a flag list for those platforms.
I will say this, no one has ever found Christ by being harassed to find Christ.
If you trespass on a forum that banned you, if you are bad enough in your sinful behavior in those trespassers, the site owner can take legal action against you if they choose.
They can also contact your ISP.
Jesus said to his Apostles, if a town doesn't receive his gospel move on . Shake the dust from your feet and go.
What you're doing if you return to a site that banned you for rule violations again and again, is wrong
Imagine doing that at someone's home. Knocking and evangelizing over and over even when asked to stop and leave .
It isn't a good look for a Christian .
If someone did that at my house they'd be arrested.
Don't knock on my door resuming this stranger is damned. And If they do,don't ever return after being told,not asked,to stop.
Your ban was a board telling you to stop! Because you can't obey their rules. You refuse to.
And that's wrong of you .