Bitcoin ETFs have made significant strides in the cryptocurrency ecosystem since their introduction to US financial markets four months ago. Despite experiencing a few hiccups in March and a seven-day outflow streak in late April and early May, the ETFs have bounced back, attracting substantial inflows. Bloomberg's ETF specialist, Eric Balchunas, notes that May inflows of $1.3 billion have offset the losses seen in April, contributing to Bitcoin's price surge to $67,000. Balchunas advises investors not to get too emotional about the inflows and outflows, as they are a normal part of ETF life. He remains optimistic about the long-term net positive impact, with over $12 billion already invested.