Just did a GOG survey that focused on the idea of a paid membership option on GOG. Seems they're determining what people would be willing to pay extra for. Some of the options were
- a tool for backing up offline installers
- ability to install previous versions of a game
- extra insight into the preservation work they're doing.
- voting rights on games to bring into the preservation program.
And others that I can't remember.
I really hate most subscriptions, because the prices are often too high, they rely on locking stuff behind paywalls, instead of providing a good service.
Here is the difference, I am ok paying monthly for storage space, servers, and hosted/managed open source web services, because there is competition and standard interfaces there. They do not hold you (or your data) hostage to their service, what they provide is good on its own.
For example, if GOG invests money into writing open source libraries, apps and APIs to efficiently and easily share save games between devices. Let people self host the open source backend, but offer up a subscription for a managed instance, with maybe some voting rights for new features or support for games/platforms to be integrated into the open source front & backend, then I would be willing to support this.
And other stuff like this.
Use subscriptions to offer good services, which also allow you to improve the whole ecosystem, while also not putting yourself as the gatekeeper, and locking people into their service.