Not arguing the uselessness of opinions about mods, especially on reddit. That said…
You do realize that google, and everyone else, scrape the hell out of lemmy right? This shit is 100% public and the nature of federation means that even if some instances officially have some rules against scraping, it just has to be federated to an instance that doesn’t. Only reason the fediverse isn’t talked about more in terms of use as training data is that it has significantly less content, not because it isn’t being used.
You missed some nuance. Don’t drive on their roads. You can drive unregistered vehicles on your own property with no issues. Many homesteaders and farmers do this with work trucks that never leave their property.
That’s where the edges of these people’s thinking begins. There’s so many tiny caveats that they believe there has to be some secret set of true rules out there for people clever enough to crack the code.
Don’t have a direct answer, but have you tried making the same short playlist on each, exporting as json from each, and comparing the files?
JSON isn’t a specific filetype that is interchangable between multiple systems. It’s just a way of organizing data as text. You can open it up in a text editor.
The format that invidious is exporting is for invidious. Invidious won’t have the data in that json file organized in the way that piped expects, which is why it says it’s not valid.
You might be able to reorganize the JSON or rename the property names to match the pattern that piped expects. You’d probably be looking at scripting something yourself though.
On android I use Revanced. It patches the official Youtube app (patches are open source) to greatly expand the base functionality and offer a lot more customization of the UI.
For me the best features are ad block, sponsorblock (skips in video sponsored segments), and complete excision of shorts from all aspects of the app.
It also works on Youtube Music, effectively allowing free premium (just don’t get the local downloads of your most listened tracks to help save data, but I have unlimited anyway).