The rules have long changed. I know back in the 80s and 90s even going to a Catholic hospital was frowned upon and dutifully avoided where possible. Now you can be active duty police, non-combat military, work at a religious school or hospital, even perform work for a church as long as it does not violate your conscience.
Although selling KH to make profit for the WTBTS real estate scam has always been allowed, even when it happened in the 90s, some were offended they didn’t hold out for another buyer but it was explained that they do these things through third parties and have no control (which is a blatant lie).