Bitcoin is broken, don't know why people still use it when there is a plenty of better alternative
Name the coin of your choice, then imagine that this coin has bitcoin's user base and number of transaction per day,
add unsolicited use of blockchain and aggressive spamming and I am sure that your coin will crumble very fast.
Well, litecoin is identical to bitcoin, but runs 4 times faster, and has hence 4 times more room. All the rest being identical, I don't see how litecoin could crumble faster than bitcoin.
Monero has self-adapting block size, so you simply cannot spam the block full. You can spam yourself poor, and the blocks would increase until you're out of money, to retract again afterwards. Moreover, monero hasn't (for the moment) any ASIC mining industry, so even though the block chain would be bulkier, and the verification much heavier, there's no structural limit, only technical costs.
Ethereum is evolving very fast, because its protocol is still entirely centralized on the Foundation, and they will never have wars like bitcoin, because they have no serious principles left after their history-rewriting hard fork. But sometimes, bastards without principles are much useful than pristine systems with design flaws.
Finally, if you only need a swift payment system, and you don't care about speculation in the long term, but just want to be sure to get your thing done, and be sure that you will always get your thing done, there's centralized ripple. It works like a charm, and there's no danger of Chinese maffia taking over or whatever.
I'm not entirely sure, but what is labelled spam on bitcoin may very well simply being the thing that bitcoin has been boasting for years, namely "the most secure blockchain in the world, the ledger that graves everything in stone", which has been used a lot by other applications, for exactly that. So all this "spam" is maybe simply other applications graving their thing on the "eternal block chain".
Bitcoin is the very first crypto currency, and it contains a lot of design flaws, of which the principal flaw that one is now being hurt with is the fact that it has a hard limit on block size. Nothing would stop bitcoin to work with bigger blocks, but that is now frozen in. But there are many others. Its emission curve is a disaster, making for speculation more than payment system, and its proof of work has separated industrials from users and is a huge waste of electricity and hardware for essentially a problem that could be solved in a totally different way. So thinking that because the Ford-T of crypto cannot handle it, no modern car can handle it, is crazy.
