Let's admit it, altcoins did have an impact to Bitcoin.
The only thing to admit is that altcoins are copycats from forks of bitcoin or tokens made on ethereum blockchain or another new mining algorithm.
With the rise of altcoins, the existence of Bitcoin become more and more popularize because of how altcoins were advertised.
No. They were all in promoting their own altcoin, not bitcoin. You just thought of it in the wring manner. But dont worry, many others also did. Their point was to use bitcoin as a source of interest to gain interest in altcoin.
Let's just take bounty campaigns as an example. With the rise of altcoins and a bunch of projects, people are incentivize to promote their project, which in turn make people aware of cryptocurrency and what is the first thing that people need to learn in cryptocurrency? That's right, Bitcoin.
No. Majority of bounty spammers are bottomfeeding 3rd world country people who are desperate to get some money earned to feed themselves. They rarely care about the project its legitimacy. The proof of this is the number of scam projects we see and the promo squad behind them, who they cry why they didnt get paid.
Remember, people need to buy Bitcoin first before they could invest into altcoins.
By saying this you debunk your entire argument. Bitcoin is the first. All others a waste of time and money.