Perhaps a coincidence, but Telegram in a Firefox tab also uses a phenomenal amount of ever increasing swapspace. I've seen Firefox reach 67GB with a Telegram tab open, it is distinctly noticable compared to just about everything else I open in the browser.
Telegram has occasionally done this on my Intel Mac mini.
I think the way it caches media is bugged right out. I changed the cache size preference from 32gb to 8gb and it eased some of the pressure on swap, but it was still insanely high. I had to switch from the App Store version to the "Desktop" version you download from the website.