On 23 August 2022 prop found that Steam would not let him add friends until he had spent 5 USD 1. His workaround was a free game, Dota Underlords 2, which is how he had added Kart, nYx and Hayan 3. The catalogue says he then used it for k1R4 as well.
Primary sources
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it wont let me add friends unless i have spent 5 usd's worth in steam
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there is this game called dota underlords on steam
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thats how i added kart nyx and hayan to my friends list