Some quotes from famous startup people:
“In a big company, you can do what all the other big companies are doing. But a startup can’t do what all the other startups do. I don’t think a lot of people realize this, even in startups. The average big company grows at about ten percent a year.
So if you’re running a big company and you do everything the way the average big company does it, you can expect to do as well as the average big company — that is, to grow about ten percent a year. The same thing will happen if you’re running a startup, of course. If you do everything the way the average startup does it, you should expect average performance.
The problem here is, average performance means that you’ll go out of business.”- Paul Graham
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"What makes disruption so devastating is the fact that, absent a crisis, it is almost impossible to avoid. Managers are paid to leverage their advantages, not destroy them; to increase margins, not obliterate them." - Naval Ravikant
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Personally, I think if your business fits in a market design by someone else, you are “default dead”. Pepsi never catches Coke. Bing never catches Google. Google Pixel never catches iPhone. The real question is can you design a market that you can dominate. Ignore competition from big corp.
If you're interested in working on it and have passion about it go for it.
Most big corps have lots of layers/decision makers so chances are slim they would attack your feature before you have traction, users and a community built around it.
Seeing a feature that can make a big difference to people is a great place to start, if you can plan a road map that will help you to grow your user base, is even better.
This doesn't sound like a business, sounds like a feature.