Technology

While that's technically possible, it's very difficult, and in my opinion, highly unlikely.

• All notes are stored in markdown, which is compatible with any other markdown-compatible app. It's not just a note format, it's a fire exit.
• Even the canvas files are now having an interoperable format created, with other industry-leading canvas style software, and that whole process was started by the Obsidian team voluntarily
• All plugins must be open-source unless explicitly and clearly stated, and such plugins are only listed on a case-by-case basis, which makes even additional plugin-specific functionality added to Obsidian easier to port over to other software if Obsidian ever does lock things down
• They don't have VC investors, and have mentioned a few times that they won't be accepting investment in the future, since they don't exactly have very high costs. They're explicitly anti "VCware." Features like Sync that depend on their server hosting bill being paid are only used by paying users, and most users will never have to use Obsidian servers past downloading and updating the app, and installing a few plugins of a few megabytes in size. Costs aren't likely to rise in any substantial way, and their team is small enough to make it profitable to operate at their existing scale.
• Actions like this are literally proactively recognizing that something wasn't in line with their manifesto, and wasn't beneficial for users, so they're removing it. Companies planning to enshittify don't usually remove enshittified/negative features they already have before re-enshittifying. They want you used to the enshittification from the start.