The Bitcoin fork was supposed to be dropped (as forks are basically "upgrades", to use simple terms). But Blockstream/Core got greedy and took the "Bitcoin" name (regardless of it needing an upgrade), and censored all of this (and continues to censor/propagandize/smear). So anyone who is buying Bitcoin, is buying only the name (and obsolete version) because the correct implementation and protocol is Bitcoin Cash. Sooner or later, the exchanges will rename Bitcoin to something like "Bitcoin Classic" and Bitcoin Cash will simply get changed to Bitcoin.