I didn't see the pattern either and had to look it up. Apparently, you can rewrite 1 + 1/(1+2) + 1/(1+2+3)+... as 2(1 - 1/2 + 1/2 - 1/3 +...+1/n - 1/(n + 1)) = 2(1 - 1/(n + 1))
From there, the limit of 2 is obvious, but I guess you just have to build up intuition with infinite sums to see the reformulation.
Klingt für mich erstmal nach ner guten Idee! Denke solche Angebote braucht es, um mit AFD und co im Internet zu konkurrieren. Twitch ist zwar nicht TikTok, aber da gibts sicherlich ne große Überlappung an usern.