I know about the bad relationship between BC and eXch, but this is a completely different field. Only inexperienced users will suffer the damage.
Even though exch is disabled on BC, this is what a search for the term exch looks like in some cases. That's enough for a scam.
i am experienced user and i suffered, i lost 20k usdt because if bestchange activity
i have posited above all the links to evidence on how Bestchange scamming people
strongly recommend avoiding this scumbags at all, never even used it otherwise you will loose your money