I tried a couple of times in the last few months to withdraw sats in Balls King from Viker (https://viker.co.uk/games/balls-king/). It always spawns an error now. It used to be a temporary thing when it happened in the past when they had to top up their channel balances. I sent them a message some time ago on Twitter, but no answer.
Are they still a thing?
Other than Thndr and Viker, are there other mobile game providers that pay you sats?
The Viker guys have a Telegram channel. They seem to have a coding bug that they are unable to fix or don't care about fixing.
But normally you can just try again the next day.
What would be the Telegram channel?
I found an old Telegram group, but I don't think it's their main one as it has been inactive for months and anyhow, one cannot send messages in the group, just get announcements from the Viker people.
t.me/vikergames
I usually play some CSGO DM in ZBD to win some sats.
https://i.imgur.com/nZpTq2t.png