Of course, will it be always possible to catch data some way. But it's a difference whether you actively work against the company and must invest money and time into it, or not.

And outside the technical level, discord also has the legal way. They can try to shut down your service, remove your code from public space and make you sink more time and money in an uphill-battle.

This is the same battle people are fighting against all walled gardens. And so far the gardens usually win. So someone taking on that fight, should be aware of this.