And because of that you'll use it to acquire even more usernames.
You opened a dispute to take someone's chat/telegram name... Not cool. What if the person was active but just didn't want to reply to you? Why would they, you don't own the rights to that username. What if they were away for personal or health reasons temporarily?
You're not a brand. You're not a product. You're someone who has those letters in your name, just like I'm sure a lot of other people.
What gives you the right to claim those usernames more than anyone else? In some cases it seems what gives you the right is just the fact that you bothered support, or opened disputes, to give you a name on another service then used that fact to get more of them.