Might not the thing you are looking for, but I tried to find a replacement for Keep a year ago and somehow stuck with a todo.txt file. It can be edited in a normal text editor but I use Markor and todo.txt on Android and Sleek on desktop. Sync is fine via your preferred sync tool.

As far as I read (I’m no expert!) they could check the SNI of the TLS handshake if they want. But using the DNS of the ISP is handing them the data right in a way they can analyze/use them very easily afaik?

Still learning about this topic!

Testing it right now and damn the results are quite impressive. But I have the same question as you, is it a good idea to use it?