Except for the sense where it's an anti-consumer concentration of market power. Something Apple is fond of. [1] Is this particular action currently illegal? Probably not, because in the US we're in an era of extreme friendliness toward companies from anti-trust regulators. But that doesn't mean no reasonable market regulator would ever frown on acquisitions like this.
[1] E.g.: https://www.theverge.com/2022/9/8/23343336/apple-tim-cook-im...