Proton said the Standard Notes app, which is available for both mobile and desktop, will remain “open source, freely available and fully supported”.
It also suggested that there will be no change to Standard Notes’ prices; its press release specifies that existing five-year subscriptions “will continue to be honored.”
“Standard Notes will remain an independent product and in due course both companies will open access to their products to each others’ users,” Proton added.
I find that fair, but at the same time, proton has a rocksolid history at this point. OFC they will likely add their features to it, and maybe remove some. But im the end its still open source and under gpl licence, so its not like proton cam change that unless they remove all other commits.