You can still have the same market and compete favourably with an established business. It takes sheer determination and strategy. The startup has to explore the weaknesses of the established business and offer something superior.If we compare a startup compete with a big established business then it would be like if I challenged heavyweight champion Tyson Fury (WBC) with a boxing challenge, with one touch I would be knocked out. Business competition means selling/making the same product and meeting in the same market. If the product is different, it means not competing. So for you as a startup, you should look for new target markets, innovate products so that they are different and have product advantages
Business startups can indeed use the same market as established businesses, but must have different characteristics or be of lower quality than products from established businesses. Like Xiaomi smartphones, even though they have the same features as Samsung, Ziaomi's price will be much cheaper so it has its own market share.You can still have the same market and compete favourably with an established business. It takes sheer determination and strategy. The startup has to explore the weaknesses of the established business and offer something superior.