Basically, there are 3 types of buyers: value PE, growth PE and strategic. Value pays 3-4x, growth 4-7x, strategics ¯\_(ツ)_/¯ Stripe would be a strategic for Baremetrics.
For private companies at around $1Mn-$3Mn ARR growing sub-20% YoY there are very few buyers in the first place.
The multiples come from direct personal experience.