Entering chat into Twitch

In the PS5, when livestream messages are configured to display:
>=101 characters => does not show anything
99 or 100 characters => the final 3 turn into an ellipsis
<=98 characters => all show

a b c d e, result

100 characters is some kind of limit
150 is the limit?
140?
other chars affect the result (limit is based on all message chars, not just matching ones?)

a*100 + b + e = 98 1 1
ab*100 + e = 50 50 0
ab*50 + e = 49 50 1
a*50 + b*50 = 50 50
a*51 + b*51 = 49 51
x*50 + a*50 + b*50 = 55.56 44.44
a*200 + b*200 = 100 0
a*120 + b*120 = 80 20
a*150 + b = 100 0
a*149 + b = 100 0
a*140 + b*10 = 100 0
a*130 + b*20 = 90 10
a*130 + b*10 = 90 10
a*130 + b = 99 1
a*130 + b*2 = 98 2
a*130 + b*5 = 95 5
'aaaaaaaaaa '*13 + b*5 = 100 0

it's only counting at most 10 b's?

'a '*60 + 'b '*40 = 85.71 14.29 (6x more a, 60 a, 10 b)
'a '*100 + 'b '*100 = 100 0
'a '*50 + 'b '*50 = 71.43 28.57 (2.5x more a, 50 a, 20 b)
'd ' + 'a '*50 + 'b '*50 = 71.43 27.14 1.43

a + b*100 = 0 100
a + 'b '*100 = 1.41 98.59 (70x more b)
ac + 'b '*100 = 1.41 97.13 1.41
ac + 'b '*150 = 1.41 97.13 1.41

if a term appears at least once, 10 slots are allocated to it, 150 slots in total?

acd + 'b '*150 = 1.39 95.83 1.39 1.39
'acd ' + 'b '*150 = 1.41 95.77 + 1.41 + 1.41 (67.92x more b)

a*70 + b*10 + c*10 + d*10 = 70 10 10 10
a*80 + b*10 + c*10 + d*10 = 70 10 10 10