Existing limits about 100 uses (on unlimited plan) has bad experience. It turns out that I created a map and completely lost access to it!

OK, it was possible to block editing/creation of new ones. But blocking the ability to view existing data actually limits my rights to access my existing information.

Such restrictions should be announced in advance, not when access is blocked.

I recommend that you limit the number of cards on the paid plan, for example 3 with full access. And when the limit is reached, I can upgrade to a higher plan and this will be a reasonable and fair restriction.

But in this case it looks like a compulsion to upgrade to a higher version to get access to your data.