With so much focus on the ‘creator economy’, and countries hit by the effects of the pandemic, the self-employed market is ‘booming’, for good or for ill. So it’s not too much of a surprise thatCollective,a subscription-based back-office for the self-employed has raised a $20 million Series A funding after launching only late last year. The round was led by General Catalyst and joined by Sound Ventures (the venture capital fund founded by Ashton Kutcher and Guy Oseary). Collective has now raised a total of $28.65 million. Other notable investors…