Yes, i think Helbiz team announced this listing if so they have chosen very bad exchange because lately, Mercatox is a very low volume exchange. SO community will not get awareness about the Helbiz listing. Only a few people are trading in Mercatox exchange.
I hope this exchange Mercatox is not one of the items on the list of listings on the top exchanges. If it is not, then it will not hurt, because the more exchanges, the more solid the coin. Even if many of them are small.