In short, registering a trademark is necessary, firstly, to increase the return on investment in your business, and secondly, to eliminate the risk of third-party claims. Trademark registration allows you to prohibit others from using it, thereby giving you a competitive advantage in the market as soon as you start marking goods with the registered mark. This way, the money you invest in promoting your brand will not be wasted, because only you — and no one else — will be able to use your registered trademark.
With a trademark, your business can also be scaled up by granting licenses, i.e., with your consent, other individuals or companies can use your trademark in their activities in exchange for a licensing fee. From the perspective of increasing your business capitalization, a trademark is not just an intangible asset — in particular, it is one that is effectively accounted for in the valuations of many successful companies, making them worth more.