for example: prize allocation for a campaign (signature) is around 2,000,000 tokens and if the project only has 1 participant in the campaign (signature) and when the project has been completed or not scammed, is it true that the participant will get the sum of all tokens (signatures)?
or maybe not at all, for other reasons?
It depends from bounty manager, if there will be a small ammount of participants, bounty campaign can be cancelled or invalidated. If project is successful there are will be a lot of bounty hunter, so dont worry about that
Yes. The signature campaign might be cancelled if there is only one participant but if there are few participants that will still promote the project, it's up to the manager if the campaign will still go on. The allocation budget will definitely be reduced enough for them to divide once the campaign has ended.