a popular wallet tonkeeper wallet shows only the seed phrase.
there is no "show private keys" option like in all adequate wallets.
is this normal?
Tonkeeper is based on BIP‑39, so technically you can derive the private key from the 24 words seed phrase and mostly ton wallets including tonkeeper or related others are also seed phrase based, which means you cannot open the wallet directly using the private key (derived from). That’s the only problem, and it’s still okay that it is a non-custodial wallet, you have full control over it.
I have never heared about tonkeeper, don't know if it's a popular (or even trustworthy) wallet... But a lot of (HD) wallet implementations work with seed phrases...
Now, in case of tonkeeper, i have no idear if this is how they work, since this is the first time i have heared about this wallet... Maybe others have seen this wallet in the past and will chip in?
It is a non-custodial HD wallet, which now only works with seed phrases (UI built that way), though it a trustworthy to this date, never heard any scam news associated with it.
Afaik, these wallets and ton coin were not very popular at that time way back then, later after
fragment.com was launched, it helped the blockchain gain a boost and earn some popularity in the crypto market, what that site actually does is allow people to literally buy and sell telegram usernames (marketplace) thru it. Then after integration with telegram so many mini play to earn games, airdrops, and mini such other apps were launched through telegram (epecially Hamster Combat......) players could receive their airdrops in their ton wallets within telegram.
Around 120 million players got airdropped hamster combat token, and the developers announced that those getting paid through tonkeeper would receive priority and slightly higher rewards, as they could collect hamster combat coins on the ton blockchain. For moving or swapping coins to other wallets required little ton coin for transaction fees, people bought ton coin in large amounts during time. As a result, at that time, ton coin reached the top 10 cryptocurrencies due to massive buying and the promotion from hamster combat. This is how they earned much popularity.