In the ever-expanding digital cosmos, Twitch stands out as a platform that has successfully proved its dominance, offering streamers a unique way to earn a lucrative income. It has aided many virtual entertainers to turn their passion into an influential career, while some utilize it as a promising side gig. However, promising as it may be, the jovial journey of these streamers is not devoid of obstacles. Twitch takes its share from the flow of subscriptions and sponsorships, often sparking controversies. Besides, now the streamers are also due to face the ramifications of new European Union tax laws that could potentially impact their payouts.

Zooming in on this issue, the new EU tax laws may pose a significant challenge for Twitch streamers. This legislation was mainly instituted to address taxation in the digital economy, yet it has far-reaching effects beyond its initial purpose. Adapting to these laws could amount to substantial effort for streamers, especially those located outside the U.S. They might now have to dig deep into cumbersome tax formalities, and this could, in turn, impact the overall profits that they draw from the platform.

Dissecting the dynamics of these changes further, the streamers will now encounter a new box on Twitch, ticking on, which might seem like another mundane task, but it elevates in significance in this context. This small step holds tremendous implications as it outlines the prerequisites defined by the EU tax legislation. Neglect of this small yet crucial detail might lead to decreased returns, potentially diminishing the substantial income streamers have been enjoying till now. 

Nevertheless, it's always the attitude towards change that determines the impact it will have. Streamers, seasoned or novice, can turn this into a learning curve. It might seem daunting at first, but streamlining their activities in accordance with the new laws might aid in the long run. They could choose to embrace and adapt to the inevitability of this modification instead of resisting it. Doing so ensures they can continue to reap the rich returns from their digital endeavors while also complying with the new taxation norms, thus keeping any unforeseen troubles at bay.

In conclusion, Twitch has indeed widened the horizons for streamers worldwide - opening doors to a realm where individuals can monetize what they love. However, it's vital to stay informed and updated about the ever-changing legal landscapes that these digital spaces inhabit. While the new EU tax laws might look like a hurdle now, streamers can surmount it with some additional effort, patience, and understanding. Balancing their digital endeavors with due diligence can ensure that their Twitch aspirations stay uninterrupted and profitable.