Why don’t more wallets exist?

full image - Repost: Why don’t more wallets exist? (from Reddit.com, Why don’t more wallets exist?)

Why are most monero wallets XMR only or only support a few coins? I'm finding that a lot of main stream wallets just don't natively support it. Is there a reason for this or do the devs just not want to take the time to integrate support for the coin?

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Mining:
Bitcoin, Cryptotab browser - Pi Network cloud PHONE MINING
Fone, cloud PHONE MINING cod. dhvd1dkx - Mintme, PC PHONE MINING

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Exchanges:
Coinbase.com - Stex.com - Probit.com

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Donations:
Done crypto