If Chipolo can launch a Find My compatible tracker to coexist with their current trackers, so can Tile.
Interesting, looks like they got around the limitation by launching a separate product that works solely with the Find My network alongside their usual product line that integrates with their own app and network.
If Tile's business does take a hit from the Find My network I can imagine them doing the same. But then it complicates things for consumers. Going down this road you will end up with one tracker for iOS, one for Android, one for Samsung and whatever other Android OEMs do their own proprietary versions, and finally one for their own network. Bit of a marketing nightmare.
I can see why Tile wants to avoid that personally. OP's email says that they want one product that works across all platforms. The approach Chipolo has had to take to get around Apple's restrictions has already given up that way of doing things.