A law would be better, otherwise companies will start with low prices and data export functionality when attracting customers, then quietly remove it right when they switch to extracting maximum value.

Even a daily export won't save you from the export functionality disappearing with zero notice, because it's really disruptive to try and stop using a service with zero notice. Your company will be left with several weeks if not months of un-exported data.

They can be sneaky about the removal, just let it "break" and it might be months before you are sure they aren't going to fix it.

People rarely get to actually negotiate contracts with a SaaS company. Unless you’re a very large customer it’s simply not worth their time. Such imbalances regularly give rise to regulations in other parts of the economy see automotive lemon laws etc.

Most SaaS companies can disable data exports at any time. Even if you’re regularly backing up that data when they disable it you need to instantly move to a new service or there’s going to be a gap.

Rate limits are bad (2/min for channel history). We've explicitly been told not to scrape API, since admins are working on exporting the data into Mattermost.