By CARLOS COSTA / AFP One of the world’s biggest technology get-togethers kicks off in the Portuguese capital on Tuesday, with organisers saying a key aim is to ask tough questions about cryptocurrencies. One of the world’s biggest technology get-togethers kicks off in the Portuguese capital on Tuesday, with organisers saying a key aim is to ask tough questions about cryptocurrencies. Around 100,000 people are expected to gather in Lisbon for the four-day Web Summit and related events, the first full-scale edition since 2019 following the disruption of the pandemic. The conference attempts to …