~
as for spam attack bitcoin.
easy solution.. implement a fee priority.
instead of everyone bidding for top price. have a formulae where if your spending funds with less than X confirms you pay more then someone who has XXX confirms.
that way spammers that need to spend multiple times a day pay the price.. or use LN for its niche. and those that use bitcoin irregularly are not forced to use LN and not forced to pay the same price as a spammer.. win win for everyone
so far spammers have never done it on a tiny scale or for a short time. they have always done it over a very long period of time (a couple of months at least) and on a very large scale (as in using thousands of addresses). they even started hiding it in 2017 well enough by running a "warm up step" first where these outputs first spread to the appropriate addresses then those addresses start spamming and after the spam was done they all aggregated again.
in other words your suggestion will only screw normal users, the spammers just have to run a "warm up step" where they spread their outputs sooner and on a larger scale to have enough confirmation on them to pay less fees.
on top of that they have proven that they don't have much of an issue with high fees, possibly even have miner ties which makes it cost a lot less for them to spam (they get the fees themselves on blocks they mine)
^ thats about malicious spammers
im talking about the day trader/mixer/gambler spammers the ones that spend more frequently than usual. but in either case average joe who may only spend once evry 5 days wont pay as much as a day trader who arbitrages 5 times a day. where the niche small market of LN would advantage a day trader rather than an average user that only spends once every 5 days.
this way it actually becomes fairer. those that do use it regular would benefit from a niche service rather than having the current system that is trying to force everyone into a niche service whether they need it or not, purely due to blind everyone pays premium fee war set up
well, i don't consider those cases to be "spam", it is normal usage even if i don't like it. and there shouldn't be any restrictions on them in my opinion. there is just too many exception cases that will end up harm regular users too. that average Joe that spends every 5 days might want to purchase two things in one day some day and his second purchase would cost a lot more just because of a bad rule that was supposed to prevent spams but it can't.