It's not an unreasonable request to ask that if it looks like you're going to post a score that's going to be a top 10 score on a scoreboard, or especially if it's going to be a top 3 score, that it's backed with a video/input replay/whatever's available as a recording more than just a photo. You can usually tell when you're working hard on a score (or any particular challenge really) that you're going to get something substantial and that you should be looking at recording runs.
I don't like the idea of mandating video for all runs though, mostly because I fear it will discourage people from submitting lower scoring runs which are valuable in fleshing out the scoreboard (runs which only get halfway through the game for instance). People might find non-clearing scores too onerous to submit if they have to upload videos for them when they're submitted more as a "here's a placeholder score, it's not great but will improve it later".
In the unusual situation where you're playing on an actual arcade cabinet without recording something and you get a really high score worth posting ("oops, I set a record at an arcade and all I have is a photo") sort of situation, it's not out of the ordinary to ask the player to submit a similar recording or showcase live play of the game if there's any question of authenticity.
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I think the rule of thumb up to this point has been that video proof is required when 1. The score is at or near top community score level
I also think it would be best to slowly make the move towards scores backed with videos and eliminate controversial scores.
Yeah, I don't think it's unrealistic (especially with recording being a lot easier than in VHS days) to ask that when scores achieved are at a community record level that they're backed with a proper recording or something more than just a photo.