Absolutely, the reality is though that Apple have locked vendors (e.g. Tile) out of the Ecosystem unless they pay the Apple tax which also also weakens security.
In order to "lock Tile" out of the ecosystem, all Apple had to do was
1) Invent the iPhone, Watch, HomePod, AirTags and iPad
2) Make 15 iterations of the operating system
3) Invent the Mac
3) Make a gazillion iterations of the operating system.
4) Get all of those devices and OSes to communicate together.
5) Develop their own UWB chip for use in their devices
6) Manufacture iPhones with that UWB chip
7) Create an app store
8) Make the OS able to communicate in the background, seamlessly, and without reducing privacy in order to disseminate the location of UWB devices, and that can notify users when they've left the devices or the devices have left them, in real time.
9) Engineer a device with a UWB chip that can communicate with iOS and MacOS.
10) Install a massive server farm to process all of the data of all of the devices in order to track the AirTags
11) Create a mapping tool that allows them to determine the location of the devices and show them on a map
Sure you can say that not inviting competitors to share your product technology is anti-competitive, but that's how markets work. If Tile wanted a system for doing what the AirTags do, all they had to do was all the things Apple did to create theirs.
Also, how does paying the "Apple Tax" weaken security? You're describing licensing, and companies have licensed technology forever.
What part of Tile not being given Apple's whole feature set in their key fobs is reducing the security of either Apple or Tile