When their launcher is literal malware or they engage in anti-consumer practices like exclusives, no, they are not good for the customer.
(Not that any publicly traded company can be good for the customer, mind; by definition they can only be good for the shareholders; any benefit they might accidentally provide to the customer or to society is an inefficiency that will eventually be corrected through enshittification. The only reason Valve isn’t entirely harmful is that they aren’t publicly traded yet.)