I don't care if people post on the other site....you can do what you want. I do think it's pretty bad when people use multiple IDs on both sites to hide behind, though. IMO that's pretty deceitful.
But what I observe is that
some people post virtually NOTHING about cars here, only political crap, and post their car project stuff over on the other site. This is a car site too, and imo most of the discussion should be about CARS, not politics. I'd say well over 90% of my posts are car-related, either progress on my Nomad, helping answer questions guys have, cars in the news, new technology, analysis of suspensions, or whatever. I usually try to welcome new members and I post politics once in a while but I've been trying to avoid it.
One ex-member got pissed at me because I said that people who only post political posts here might as well get lost....I didn't specifically reference him and wasn't referring to anyone in particular, but apparently it hit a nerve with him. He posts tons of progress pics of his 57 on the other site, and I asked him multiple times in PM to please do the same here since he has a pretty cool project. He did post about it once or twice, but then got offended because I said that IN MY OPINION posting only about politics here is BS. And now he's copying my seat mount design that another guy (a past customer of mine) gave him and doesn't say one word about who actually designed it.
In some ways, I now understand why the other site doesn't allow political posts. Maybe we need a rule here that you're allowed ONE political post for every 50 posts about cars.