Here is a daily wagered amount on some of the popular bitcoin gambling sites. You can clearly see that the last 6 months has some spike in daily wagering volume. Though last year in same time had a bit better daily average. Could be several things associated with the volume and still we couldn't explain the influence of lockdown. I have taken the image from https://dicesites.com/graphs and you can play with different variables to get the exact data you need from there.
The spikes from Oct to December looks interesting. Doesn't look like it that was caused by crisis/lockdown. The spikes increase a bit around January (2020) with fewer wager on smaller amounts compared to May — Dec19 (2019). < This could be caused by the crisis
