FYI, Bitcoin SV is already doing something like this, and they already have a system devised for splitting up large files into several OP_RETURN transactions, but I'm not sure if they have a keying mechanism. That is the icing on the cake. - but the idea could be taken further with features such as splitting up large files, versioning, and whatever else.
it is because these altcoins have no use cases as a cryptocurrency or anything else. so their owners have to come up with different "ideas" that could invent some use case and create spam so that the coin doesn't look abandoned when you look at how many transactions are being made every day.
i find it very strange that they are splitting the data into
multiple OP_Return outputs instead of one since each output will have at least 10 extra repeated bytes! i already explained why it is the worst in my previous comment.
The moment it would become a standard I would for sure turn off my node.
it won't. and you don't need to shut down your node, you can easily reject anything that you think is non-standard as your node is already doing it.