I'm getting tired of the anti-trust meme. Introducing a product that competes with other products is not anti-competitive behavior. Having a manufacturer/platform-exclusive feature is not anti-competitive (patents are a legal, limited-time monopoly intended to stimulate innovation). Even being one of the world's biggest companies and introducing a new product is not anti-competitive. It's how you behave "on the playing field" that becomes potentially anti-competitive. And a key test of anti-competitive behavior is whether it hurts consumers (higher prices, lack of choice, etc.). Businesses get hurt on the competitive playing field all the time - that's supposed to be the nature of the free market/competition. Behavior becomes anti-competitive when it prevents the free market from functioning in a normal manner.
And even if Apple's behavior turned out to be anti-competitive, tracking tags are such a small market segment that the legal bills would be higher than the fines imposed (if found guilty). The chances that Apple delayed AirTags out of fear of anti-trust complaints seems very unlikely to me. Everything Apple does today triggers complaints from someone. If they feared complaints they may as well liquidate the company and go home.
Tile is screaming "anti-trust" because it's to their advantage to do so. They get lots of free publicity (every government hearing in every country), some Apple-hater sympathy purchases, and may even get lucky and have some legislation passed to their benefit.