They are seriously suffering from NIH (not invented here) syndrome. So, you can theoretically build your own Telegram client, but you can't re-use any standard components to do so. WhatsApp on the other hand doesn't open their clients, but under the hood they are just using mostly standard components (Noise protocol, modified XMPP protocol, Signal protocol), so it's not actually that difficult to build your own WhatsApp client by just piecing together these components.
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