If you start charging VAT in the future and that means price increase then please notify all users beforehand. I will personally cancel my subscription in that case. I would not like it to be a surprise on my bill.
A price hike from USD 10.00 to USD 12.30 in Poland will kill sales in thisi region.
For example Spotify cost in the US is USD 10.99 and in Poland it's PLN 19.99, VAT included (USD 4.96). People are not willing to pay more. So Kagi to Spotify ratio in the US is 91%. In Poland a 23% price increase would mean a Kagi/Spotify ratio of 248%.
Netflix price is USD 15.49 in the US and USD 10.67 (PLN 43 incl. VAT) in Poland, which means Kagi to Netflix ratio in the US:
65%, Kagi to Netflix ratio in Poland: 115%.
Youtube Premium price in USD 13.99 in the US and USD 6.45 (25.99 incl. VAT) in Poland, that gives Kagi/YTPremium ratio: 71% in the US and 191% in Poland.
There are countries with MUCH worse purchase power parity now than Poland for example Kenya or India but prices are the same as in California which will lead to very few sales as people compare your prices with other online services that require much more bandwith and resources than Kagi yet they can keep prices low.