On bustabit (which has been going like 6 years):
Ryan: !streak < 2
Shiba: Seen 20 streak in games #2347733 - #2347752: 1.85x, 1.23x, 1.19x, 1.41x, 1.25x, 1.41x, 1.21x, 1.59x... (1,181,337 games ago, 10M 4d 18h 51m 51s ago)
I'm not sure how to do the same query on roobet (although wouldn't be overly hard to compute manually), but roobet has a significantly higher house edge which would be negated by the fact they have not been running nearly as long, so I'd guess the longest red streak is pretty similar)