There is nothing at all being copied but an aesthetic.
Although to me it is interesting that, even without literal copying, a generator might be capable of potentially emulating some key features of a specified source. Can this sometimes arguably extend beyond just "an aesthetic"? We've all seen examples similar to this one (from the SD online demo, default setting, with a familiar public-domain source) — https://i.imgur.com/PUJs3RL.png
Apparently, the error condition might NOT be dependent on idle time (a period of time without any interaction). — Evidence: Periodic clicks on a vote button, scripted at 45-second intervals, did not prevent the error's eventual occurrence.
Although they differ from Twitter Likes, note that Mastodon Favorites are not private. For an example, I'll refer to one of your toots:
https://mastodon.social/@justhach/110696151311920356
Viewing it in the Mastodon web interface, I see an indication that 2 people marked it as a Favorite. I can then click to see those 2 usernames, listed here:
https://mastodon.social/@justhach/110696151311920356/favourites
Such listings are limited though. For example, I'm viewing a toot that you boosted, and I see an indication that it has been marked as a Favorite by 816 users; but when I click to view their names, I see only 40 of them listed.
https://www.youtube.com/watch?v=hj6mfH-YO_4&t=29s