The biggest edits I ever did on Wikipedia, many years ago now, were to the articles about ZX Spectrum games.
I spent hours loading up games in emulators, capturing screenshots, writing out information, etc. Most of the articles for those games existed already, I just did things like link the developers, publishers, etc. categorised them, added screenshots where they were missing.
By a year later, every screenshot I'd done had been removed. Not because of copyright - but because when I'd first done them, I'd tagged them as per the required tags for copyright (e.g. fair usage, etc.). I'd spent forever putting all the tags on after being told for one article. The next month, my images were removed because a new tag had been introduced and I hadn't updated the images with it. So I updated the tags. Repeat ad infinitum for nearly a year. Every time, warnings about tags, copyright-tag bots spamming my talk page, new tags popping out of nowhere and serving no new purpose but those same bots stripping any images that did not have them.
In the end, I gave up. I stopped editing. I stopped categorising. I stopped screenshotting. All my screenshots (despite being perfectly fine for a year while I was tagging them) disappeared within a month. Most of those articles never got even a title screenshot back and are now either plain-text or the entire article is history.
And every "new" game article I added was removed for being "non-notable", when tiny little indie game articles stayed up for years, and the article were about huge, mainstream, industry-changing games.
Sorry, but my time and effort was wasted, not by fans of the games, readers of the articles, or even the article curators. Just by random paranoid spamming bots and people who - at first - I presumed were editors and moderators but actually were most likely just random people who wanted to criticize and break the articles for their own stats(?), I don't know.
All that happened is that the articles turned to dust and rotted over the years while the talk pages filled up with arguments.