It's not anti-competitive if you're a relatively small player or trying to build a market.

Comparison: when a new restaurant opens, it's very common to hand out coupons in the neighborhood for discounts or free meals. Those free meals will be sold at a loss, with the goal of building a customer base. Think of it as marketing.

EOD, "anti-competitive" is evaluated on the outcome -- does the success of the company running the discounts make the market more or less competitive if they succeed? If a company is already the dominant player in a market, it's anti-competitive to price dump to keep new entrants out.

But if the company is new and trying to disrupt established players (or trying to create a market where one didn't exist), it's very hard to argue that there's less competition due to their success.