1. Try using pi-hole to block those particular endpoints via making DNS resolution fail; see if it still works if it can’t access the telemetry endpoints.
2. Their ridiculous tracking, disregard of the user preference to not send telemetry, and behavior on the Discord when you mentioned tracking says everything you need to know about the company. You cannot change them. If you don’t want to be tracked, then stay away from Bytedance.
Although there are caveats -- if an app decides to use its own DNS server, sometimes secure DNS, you are still out of luck. I just recently discovered that Android webview may bypass whatever DNS your Wi-Fi points to.