You're certainly able to pay for BitBucket, it's just that they don't require you to pay until you reach a team of 6 people. You can pay $10 a month to BitBucke

You're certainly able to pay for BitBucket, it's just that they don't require you to pay until you reach a team of 6 people. You can pay $10 a month to BitBucket and be able to have a team of 10 if you'd like, even if it's just yourself.