could be a simple “redirect to a different instance” button, where you could select yours
Though not perfect, that would be a vast improvement on now. There are thousands of instances (remembering content is shared to Mastodon and others), and not every instance knows about every other, but you could auto-fill from the list the instance knows about, and if you end up back on that site it should remember what you selected last time and prefill it. Great idea!
Or the site could check for the cookies of known servers
This is simply not possible because browsers don’t let a site do this.




Basically concerns from contributors about the governance structure of the project and how their drive for profit may impact it. And how this FOSS project with significant community contributions has it’s shareholders (yes it has shareholders) considering it their sole property.
There’s a little on Wikipedia here.
And an open letter: https://openletter.earth/open-letter-to-organic-maps-shareholders-a0bf770c