While I like and appreciate the campaign, the issue IMO is bigger. IoT devices for example even have environmental impact when services behind them get discontinued.
I would therefore like a more general rule: whenever a product is discontinued for whatever reason, all necessary documents, sources, etc need to be released to allow third parties to take over maintenance (that also includes schematics for hardware repairs).
Bitwardens local cache does not include attachments, though. If you rely on them, you have to rely on the server being available.