Trademark right is a territorial right. trademark protection is necessary to avoid infringement attack and protect your brand name, if your business is ever related to India market, say, exporting to India, OEM business using Indian manufacturer, Outsourced work to India, KPO, BPO, LPO, Captive Centers or any research and are planning to launch the products/services to Indian market in future.
Also trademark registration is required to list your product/service online at different platforms like Amazon, Flipkart, Ajio, Snapdeal, YouTube etc. Registration provides the trademark owner with a right to sue for damages when infringements of trademarks occur.
An Indian trademark will allow you to get into Brand Registry.
To open in a new tab, click: Why should I consider registering my trademark in India?