Never use Electrum unless you're hosting your own backend. There is no telling how many public Electrum servers are run by chain analysis companies and other adversaries that are in the business of attributing IP addresses to UTXOs.

Electrum was a great piece of software 10 years ago, but the surveillance landscape has changed a lot since then and it is not really safe to use it in its default state.

TLDR: run your own Electrum backend or don't use Electrum.