So why should people use a brand new coin that is an exact clone of Bitcoin when Bitcoin is the exact same thing but has been around longer, has the largest use, and has the largest user base?
Why? Because the Corporation will promote Corp Coin on its website. It will have giveaways and prizes if you start using it. It will give away free Corp Coin USB miners. It will be exciting and fantastic.
BTC around for longer. And? Actually, BTC being around for longer could be spun as a disadvantage. A lot of people whine that the early adopters have a shit ton of coins, and that's "unfair". Now, the Corporation comes in, and launches a new coin that's open to everyone around the world. No unfair early adopters. Everyone can get as much as they want.
Largest use. No it doesn't. All of the businesses that accept or use BTC can very easily start using Corp Coin. It's just a few lines of code for them. Once they see the exploding user base for Corp Coin, they'll start accepting it.
Largest user base. Not so fast. With 1 billion customers worldwide, even if 10% of them start using Corp Coin, that's 100,000,000 users. BTC probably has around 1,000,000 users. So Corp Coin will have 100x the users right away.
If you create such a coin and you have such a large number of users, how many do you think would actually begin using Corp Coin when all they hear about cryptocurrencies is all the negative stuff that the media reports? How many people would actually use Corp Coin within its first few weeks of launch? By the time that people begin using then, they will also complain about how the early adopters in those first couple of weeks who were able to mine with cpu and gpus or maybe even ASICs have over 90% of the coins. If people with several terahashes of SHA256 ASICS they could point them at this new coin, make the difficulty spike and earn tons of Corp Coin (Free Money!!) in the first few weeks. Then they could pull away their miners and go back to Bitcoin and leave the difficulty incredibly high, leaving your network insecure and impossible to mine without more ASICS. Your USB ASIC miners would soon be just as out of date and worthless as they are now in Bitcoin.