It's hard to conclude what exactly the reason is, but glad to see nonetheless. I can't recall any new government decision that makes buying Bitcoin more difficult in CEX in those countries (maybe the tax issue mentioned above?). Either people are moving away from CEX or those are the same people with more volume because they trust the platform.
Government's newest restrictions on crypto (maybe), better awareness on advantages of CEX, try to not submit identity documents for KYCs on DEX, just one of potential reasons.
I'd prefer to move further and mention about
payment methods that are important to attract new users on CEX or P2P markeplaces. Paxful, ie. has 300+ payment methods for their users and recent months, the platform has been upgraded a lot. They have huge trading volume in
giftcard payment method. Furthermore, promotions and advertisements are other factors that help them to attract new users, expand to new nations and increase their total trading volume.
We are talking about bitcoin adoption and it is not only related to bitcoin adoption (buy
BTC, trade it, hold it), it needs other payment methods to help it invades deeper in lives. P2P marketplaces help people to get it well.
The pandemic can have its impact somewhat. People have to work at home, online more than before the pandemic. It in turn possibly triggered more people to work online and consider make-money-online as their main job or temporary part-time job. P2P marketplaces meet their demands in the pandemic.