You're entirely right. Defending against the encroaching of our rights and the freedoms afforded by the internet (or freedoms in general) requires constant vigilance. A one-time win doesn't matter - big interest groups continue to exist and continue to pour money intro ensuring their interests are disproportionately represented.
This is a losing battle for us. It's a gradual chipping away at our rights that will continue because it simply requires too much effort on the part of citizens.
On the face of it, the fix is rather simple: Vote for politicians who listen at least as much to civil society as they do to corporate lobbyists.
Unfortunately, the political system currently structurally incentivizes the opposite, especially at the EU level, about which there is little reporting because that is all organized at the national level. If Julia Reda weren't an MEP and hadn't been sounding the alarm for years now, the first you heard about Article 13 may have been after the final vote in which an even worse version of it was enacted.
At this point, the Greens/EFA group in the EP is the only one which has even taken the time to build infrastructure to voluntarily track (necessary to even hope to achieve any kind of balance!) and transparently publish their lobby meetings online. (Here's an ugly backend view, the pretty one is on individual MEPs' websites: https://lobbycal.greens-efa-service.eu/all/)
This is a losing battle for us. It's a gradual chipping away at our rights that will continue because it simply requires too much effort on the part of citizens.