Has anyone successfully built a bankroll strictly from freerolls? (No deposits)

Hey everyone,
I'm curious about the ultimate online poker challenge and wanted to ask the community:
Has anyone actually built a bankroll starting strictly from online freerolls, without ever making a single deposit?
I am talking about grinding out those micro-prizes ($0.50, $1, $2 at a time), taking those tiny winnings to the lowest micro-stakes cash tables or Sit & Gos, and successfully spinning it up. [1, 2]
If you managed to do this:

• Which online poker sites or specific freerolls were the best?
• How long did it take you to build a comfortable bankroll?
• What was your strategy for transitioning from freeroll chaos to real-money micro-stakes?

I’d love to hear your success stories, timelines, or even warnings if you think it's too hard to do nowadays.
Thanks for sharing your journeys!