For speedrunning, a massive amount of recordkeeping for speedruns by sites like SRC is done through posting twitch highlights. This could end up nuking entire leaderboards, especially for categories or games with runs that last more than a couple hours. Despite mostly sticking to shorter runs...
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For casual streaming, it's even worse. I've been streaming for over 10 years and played hundreds of games on stream. My highlighted streams of Bard's Tale IV alone account for over 150 hours.